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A two-party system is a system where two major political parties dominate politics within a government. One of the two parties typically holds a majority in the legislature and is usually referred to as the majority party while the other is the minority party. The term has different senses. For example, in the United States, Jamaica, and Malta, the sense of two party system describes an arrangement in which all or nearly all elected officials only belong to one of the two major parties, and third parties rarely win any seats in the legislature. In such arrangements, two-party systems are thought to result from various factors like winner takes all election rules. In such systems, while chances for third party candidates winning election to major national office are remote, it is possible for groups within the larger parties, or in opposition to one or both of them, to exert influence on the two major parties. In contrast, in the United Kingdom and in other parliamentary systems and elsewhere, the term two-party system is sometimes used to indicate an arrangement in which two major parties dominate elections but in which there are viable third parties which do win seats in the legislature, and in which the two major parties exert proportionately greater influence than their percentage of votes would suggest.
There is strong agreement that the United States has a two-party system; historically, there have been few instances in which third party candidates won an election. In the First Party System, only the Federalist Party and Thomas Jefferson's Republican Party were significant political parties. Toward the end of the First Party System, the Republicans held a single-party system (primarily under the Presidency of James Monroe). Under the Second Party System, the Republican Party split during the election of 1824 into Adams' Men and Jackson's Men. In 1828, the modern Democratic Party formed in support of Andrew Jackson. The National Republicans were formed in support of John Quincy Adams. After the National Republicans collapsed, the Whig Party and the Free Soil Party quickly formed and collapsed. In 1854, the modern Republican Party formed from a loose coalition of former Whigs, Free Soilers and other anti-slavery activists.
During the Third Party System, the Republican Party was the dominant political faction, but the Democrats held a strong, loyal coalition in the Solid South. During the Fourth Party System, the Republicans remained the dominant Presidential party, although Democrats Grover Cleveland and Woodrow Wilson were both elected to two terms. In 1932, at the onset of the Fifth Party System, Democrats took firm control of national politics with the landslide victories of Franklin D. Roosevelt in four consecutive elections. Other than the two terms of Republican Dwight Eisenhower from 1953 to 1961, Democrats retained firm control of the Presidency until the mid-1960s. Since the mid-1960s, despite a number of land slides (such as Ronald Reagan carrying 49 states and 58% of the popular vote over Walter Mondale in 1984), Presidential elections have been competitive between the predominant Republican and Democratic parties and no one party has been able to hold the Presidency for more than three consecutive terms. In the election of 2012, only 4% separated the popular vote between Barack Obama (51%) and Mitt Romney (47%), although Obama won the electoral vote by a landslide (332-206).
Throughout every American party system, no third party has won a Presidential election or majorities in either house of Congress. Despite that, third parties and third party candidates have gained traction and support. In the election of 1912, Theodore Roosevelt won 27% of the popular vote and 88 electoral votes running as a Progressive. In the 1992 Presidential election, Ross Perot won 19% of the popular vote but no electoral votes running as an Independent.
In countries such as Britain and Spain, two major parties emerge which have strong influence and tend to elect most of the candidates, but a multitude of lesser parties exist with varying degrees of influence, and sometimes these lesser parties are able to elect officials who participate in the legislature. A report in the Christian Science Monitor, for example, suggested that Spain was moving towards a "greater two-party system" while acknowledging that Spain has "many small parties." In political systems based on the Westminster system, which is a particular style of parliamentary democracy based on the British model and found in many commonwealth countries, a majority party will form the government and the minority party will form the opposition, and coalitions of lesser parties are possible; in the rare circumstance in which neither party is the majority, a hung parliament arises. Sometimes these systems are described as two-party systems but they are usually referred to as multi-party systems. There is not always a sharp boundary between a two-party system and a multi-party system.
Generally, a two-party system becomes a dichotomous division of the political spectrum with an ostensibly right-wing and left-wing party: the Nationalist Party vs. the Labour Party in Malta, Liberal vs. Labor in Australia, Republicans vs. Democrats in the United States and the Conservative Party vs. the Labour Party in the United Kingdom.
Other parties in these countries may have seen candidates elected to local or subnational office, however. Historian John Hicks claims that the United States has never possessed for any considerable period of time the two party system in its pure and undefiled form.
In some governments, certain chambers may resemble a two-party system and others a multi-party system. For example, the politics of Australia are largely two-party (if the Liberal Party and National Party are considered the same party at a national level due to their long-standing alliance) for the Australian House of Representatives, which is elected by Instant Runoff Voting, (known within Australia as preferential voting). However, third parties are more common in the Australian Senate, which uses a proportional voting system more amenable to minor parties.
India too is showing characteristics of two party system with United Progressive Alliance (UPA) and National Democratic Alliance (NDA) as the two main players. It is to be noted that both UPA and NDA are not two political parties but alliances of several smaller parties. Other smaller parties not aligned with either NDA or UPA exist, and overall command about 20% of the 2009 seats in the Lok Sabha.
Malta are somewhat unusual in that while the electoral system is single transferable vote (STV), traditionally associated with proportional representation, minor parties have not earned much success. No third parties won any seats in the Parliament in Malta's most recent election, for example. The Labour Party and the Nationalist Party are the dominant parties.
Comparisons with other party systems
Two-party systems can be compared with:
- Multi-party systems. In these, the effective number of parties is greater than two but usually fewer than five; in a two-party system, the effective number of parties is two (according to one analysis, the actual average number of parties varies between 1.7 and 2.1.) The parties in a multi-party system can control government separately or as a coalition; in a two-party system, however, coalition governments rarely form. Examples of nations with multi-party systems include Brazil, Canada, Denmark, Finland, France, Germany, India, Pakistan, Indonesia, Ireland, Israel, Italy, Mexico, Nepal, the Netherlands, New Zealand, Norway, Portugal, Spain, Sweden and the Taiwan.
- Single-party systems or dominant-party systems happen in nations where no more than one party is codified in law and/or officially recognized, or where alternate parties are restricted by the dominant party which wields power. Examples include rule by the Communist Party of China and the People's Action Party of Singapore.
There are several reasons why, in some systems, two major parties dominate the political landscape. There has been speculation that a two-party system arose in the United States from early political battling between the federalists and anti-federalists in the first few decades after the ratification of the Constitution, according to several views. In addition, there has been more speculation that the winner-takes-all electoral system as well as particular state and federal laws regarding voting procedures helped to cause a two-party system.
Political scientists such as  and William H. Riker claim that there are strong correlations between voting rules and type of party system. Jeffrey D. Sachs agreed that there was a link between voting arrangements and the effective number of parties. Sachs explained how the First Past The Post voting arrangement tended to promote a two-party system:
The main reason for America's majoritarian character is the electoral system for Congress. Members of Congress are elected in single-member districts according to the "first-past-the-post" (FPTP) principle, meaning that the candidate with the plurality of votes is the winner of the congressional seat. The losing party or parties win no representation at all. The first-past-the-post election tends to produce a small number of major parties, perhaps just two, a principle known in political science as Duverger's Law. Smaller parties are trampled in first-past-the-post elections.—Sachs, The Price of Civilization, 2011
Consider a system in which voters can vote for any candidate from any one of many parties. Suppose further that if a party gets 15% of votes, then that party will win 15% of the seats in the legislature. This is termed proportional representation or more accurately as party-proportional representation. Political scientists speculate that proportional representation leads logically to multi-party systems, since it allows new parties to build a niche in the legislature:
Because even a minor party may still obtain at least a few seats in the legislature, smaller parties have a greater incentive to organize under such electoral systems than they do in the United States.—Schmidt, Shelley, Bardes (2008), 
In contrast, a voting system that allows only a single winner for each possible legislative seat is sometimes termed a 
In the U.S., forty-eight states have a standard winner-takes-all electoral system for amassing presidential votes in the Electoral College system. The winner–takes–all principle applies in presidential elections, since if a presidential candidate gets the most votes in any particular state, all of the electoral votes from that state are awarded. In all but two states, Maine and Nebraska, the presidential candidate winning a plurality of votes wins all of the electoral votes, a practice called the unit rule.
Duverger concluded that "plurality election single-ballot procedures are likely to produce two-party systems, whereas proportional representation and runoff designs encourage multipartyism." He suggested there were two reasons why winner–takes–all systems leads to a two-party system. First, the weaker parties are pressured to form an alliance, sometimes called a fusion, to try to become big enough to challenge a large dominant party and, in so doing, gain political clout in the legislature. Second, voters learn, over time, not to vote for candidates outside of one of the two large parties since their votes for third party candidates are usually ineffectual. As a result, weaker parties are eliminated by voters over time. Duverger pointed to statistics and tactics to suggest that voters tended to gravitate towards one of the two main parties, a phenomenon which he called polarization, and tend to shun third parties. For example, some analysts suggest that the Electoral College system in the United States, by favoring a system of winner–takes–all in presidential elections, is a structural choice favoring only two major parties.
Gary Cox suggested that America's two-party system was highly related with economic prosperity in the country:
The bounty of the American economy, the fluidity of American society, the remarkable unity of the American people, and, most important, the success of the American experiment have all mitigated against the emergence of large dissenting groups that would seek satisfaction of their special needs through the formation of political parties.—Cox, according to George Edwards
An effort in 2012 by centrist groups to promote ballot access by Third Party candidates called Americans Elect spent $15 million to get ballot access but failed to elect any candidates. The lack of choice in a two-party model in politics has often been compared to the variety of choices in the marketplace.
Politics has lagged our social and business evolution ... There are 30 brands of Pringles in our local grocery store. How is it that Americans have so much selection for potato chips and only two brands — and not very good ones — for political parties?—Scott Ehredt of the Centrist Alliance
Third parties, meaning a party other than one of the two dominant parties, are possible in two-party systems, but they are often unlikely to exert much influence by gaining control of legislatures or by winning elections. While there are occasional opinions in the media expressed about the possibility of third parties emerging in the United States, for example, political insiders such as the 1980 presidential candidate John Anderson think the chances of one appearing in the early twenty-first century is remote. A report in The Guardian suggested that American politics has been "stuck in a two-way fight between Republicans and Democrats" since the Civil War, and that third-party runs had little meaningful success.
Third parties in a two-party system can be:
- built around a particular ideology or interest group
- split off from one of the major parties or
- focused on a charismatic individual.
When third parties are built around an ideology which is at odds with the majority mindset, many members belong to such a party not for the purpose of expecting electoral success but rather for personal or psychological reasons. In the U.S., third parties include older ones such as the Libertarian Party and the Green Party and newer ones such as the Pirate Party. Many believe that third parties don't affect American politics by winning elections, but they can act as "spoilers" by taking votes from one of the two major parties. They act like barometers of change in the political mood since they push the major parties to consider their demands. An analysis in New York Magazine by Ryan Lizza in 2006 suggested that third parties arose from time to time in the nineteenth century around single-issue movements such as abolition, women's suffrage, and the direct election of senators, but were less prominent in the twentieth century.
A so-called third party in the United Kingdom are the Liberal Democrats. In the 2010 election, the Liberal Democrats received 23% of the votes but only 9% of the seats in the House of Commons. While electoral results do not necessarily translate into legislative seats, the Liberal Democrats can exert influence if there is a situation such as a hung parliament. In this instance, neither of the two main parties (at present, the Conservative Party and the Labour Party) have sufficient authority to run the government. Accordingly, the Liberal Democrats can in theory exert tremendous influence in such a situation since they can ally with one of the two main parties to form a coalition. This happened in the Coalition government of 2010. Yet in that more than 13% of the seats in the British House of Commons are held in 2011 by representatives of political parties other than the two leading political parties of that nation, contemporary Britain is considered by some to be a multi-party system, and not a two-party system.
Some historians have suggested that two-party systems promote centrism and encourages political parties to find common positions which appeal to wide swaths of the electorate. It can lead to political stability which leads, in turn, to economic growth. Historian Patrick Allitt of the Teaching Company suggested that it is difficult to overestimate the long term economic benefits of political stability. Sometimes two-party systems have been seen as preferable to multi-party systems because they are simpler to govern, with less fractiousness and greater harmony, since it discourages radical minor parties, while multi-party systems can sometimes lead to hung parliaments. Italy, with a multi-party system, has had years of divisive politics since 2000, although analyst Silvia Aloisi suggested in 2008 that the nation may be moving closer to a two-party arrangement. The two-party has been identified as simpler since there are fewer voting choices. One analyst suggested the two-party system, in contrast with proportional representation, prevented excessive government interference with economic policy.
Two-party systems have been criticized for downplaying alternative views, being less competitive, encouraging voter apathy since there is a perception of fewer choices, and putting a damper on debate within a nation. In a proportional representation system, lesser parties can moderate policy since they are not usually eliminated from government. One analyst suggested the two-party approach may not promote inter-party compromise but may encourage partisanship. In The Tyranny of the Two–party system, Lisa Jane Disch criticizes two-party systems for failing to provide enough options since only two choices are permitted on the ballot. She wrote:
Herein lies the central tension of the two–party doctrine. It identifies popular sovereignty with choice, and then limits choice to one party or the other. If there is any truth to Schattschneider's analogy between elections and markets, America's faith in the two–party system begs the following question: Why do voters accept as the ultimate in political freedom a binary option they would surely protest as consumers? ... This is the tyranny of the two–party system, the construct that persuades United States citizens to accept two–party contests as a condition of electoral democracy.—Lisa Jane Disch, 2002
There have been arguments that the winner-take-all mechanism discourages independent or third-party candidates from running for office or promulgating their views. Ross Perot's former campaign manager wrote that the problem with having only two parties is that the nation loses "the ability for things to bubble up from the body politic and give voice to things that aren’t being voiced by the major parties." One analyst suggested that parliamentary systems, which typically are multi-party in nature, lead to a better "centralization of policy expertise" in government. Multi-party governments permit wider and more diverse viewpoints in government, and encourage dominant parties to make deals with weaker parties to form winning coalitions. While there is considerable debate about the relative merits of a constitutional arrangement such as that of the United States versus a parliamentary arrangement such as Britain, analysts have noted that most democracies around the world have chosen the British multi-party model. Analyst Chris Weigant of the Huffington Post wrote that "the parliamentary system is inherently much more open to minority parties getting much better representation than third parties do in the American system." After an election in which the party changes, there can be a “polar shift in policy-making” when voters react to changes.
Beginnings of parties in Britain
The two-party system, in the sense of the looser definition, where two parties dominate politics but in which third parties can elect members and gain some representation in the legislature, can be traced to the development of political parties in the United Kingdom. There was a division in English politics at the time of the Civil War and Glorious Revolution in the late 17th century. The Whigs supported Protestant constitutional monarchy against absolute rule and the Tories, originating in the Royalist (or "Cavalier") faction of the English Civil War, were conservative royalist supporters of a strong monarchy as a counterbalance to the republican tendencies of Parliament. In the following century, the Whig party's support base widened to include emerging industrial interests and wealthy merchants.
The basic matters of principle that defined the struggle between the two factions, were concerning the nature of constitutional monarchy, the desirability of a Catholic king, the extension of religious toleration to nonconformist Protestants, and other issues that had been put on the liberal agenda through the political concepts propounded by John Locke, Algernon Sidney and others.
Vigorous struggle between the two factions characterised the period from the Whig supremacy under Robert Walpole, during which the Tories were systematically purged from high positions in government. However, although the Tories were dismissed from office for half a century, they still retained a measure of party cohesion under William Wyndham and acted as a united, though unavailing, opposition to Whig corruption and scandals. At times they cooperated with the "Opposition Whigs", Whigs who were in opposition to the Whig government; however, the ideological gap between the Tories and the Opposition Whigs prevented them from coalescing as a single party.
Emergence of the two-party system in Britain
The old Whig leadership dissolved in the 1760s into a decade of factional chaos with distinct "Grenvillite", "Bedfordite", "Rockinghamite", and "Chathamite" factions successively in power, and all referring to themselves as "Whigs". Out of this chaos, the first distinctive parties emerged. The first such party was the Rockingham Whigs under the leadership of Charles Watson-Wentworth and the intellectual guidance of the political philosopher Edmund Burke. Burke laid out a philosophy that described the basic framework of the political party as "a body of men united for promoting by their joint endeavours the national interest, upon some particular principle in which they are all agreed". As opposed to the instability of the earlier factions, which were often tied to a particular leader and could disintegrate if removed from power, the two party system was centred on a set of core principles held by both sides and that allowed the party out of power to remain as the Loyal Opposition to the governing party.
A genuine two-party system began to emerge, with the accession to power of William Pitt the Younger in 1783 leading the new Tories, against a reconstituted "Whig" party led by the radical politician Charles James Fox.
The two party system matured in the early 19th century era of political reform, when the franchise was widened and politics entered into the basic divide between conservatism and liberalism that has fundamentally endured up to the present. The modern Conservative Party was created out of the 'Pittite' Tories by Robert Peel, who issued the Tamworth Manifesto in 1834 which set out the basic principles of Conservatism; - the necessity in specific cases of reform in order to survive, but an opposition to unnecessary change, that could lead to "a perpetual vortex of agitation". Meanwhile, the Whigs, along with free trade Tory followers of Robert Peel, and independent Radicals, formed the Liberal Party under Lord Palmerston in 1859, and transformed into a party of the growing urban middle-class, under the long leadership of William Ewart Gladstone. The two party system had come of age at the time of Gladstone and his Conservative rival Benjamin Disraeli after the 1867 Reform Act.
History of American political parties
Although the Founding Fathers of the United States did not originally intend for American politics to be partisan, early political controversies in the 1790s saw the emergence of a proto two-party political system, the Federalist Party and the Democratic-Republican Party, centred on the differing views on federal government powers of Secretary of the Treasury Alexander Hamilton and James Madison. However, a consensus reached on these issues ended party politics in 1816 for a decade, a period commonly known as the Era of Good Feelings.
Partisan politics revived in 1829 with the split of the Democratic-Republican Party into the Jacksonian Democrats led by Andrew Jackson, and the Whig Party, led by Henry Clay. The former evolved into the modern Democratic Party and the latter was replaced with the Republican Party as one of the two main parties in the 1850s.
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- Regis Publishing, The US System: Winner Takes All, Accessed Aug. 12, 2013, “...Winner-take-all rules trigger a cycle that leads to and strengthens a system of few (two in the US) political parties...”
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- Eric Black, Minnpost, October 8, 2012, Why the same two parties dominate our two-party system, Accessed Aug. 12, 2013, “...SMDP (single-member districts, plurality) voting system. ... This forces those who might favor a minor party candidate to either vote for whichever of the two biggest parties the voter dislikes the least, or to risk the likelihood that their vote will be “wasted” or, worse, that they will end up helping the major-party candidate whom the voter dislikes the most to win. Minor parties aren’t banned, but they seldom produce a plurality winner, and their lack of success often causes the minor parties to wither and die....”
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- George F. Will, October 12, 2006, Washington Post, From Schwarzenegger, a Veto for Voters' Good, Accessed Aug. 12, 2013, “...That electoral vote system (combined with the winner-take-all allocation of votes in all states but Maine and Nebraska) makes it very difficult for third-party presidential candidates to be competitive...”
- Ashley Ford, Sept. 17, 2012, Cavalier Daily, Party of three: A third political party is an important aspect of the Virginia democratic process, Accessed Aug. 12, 2013, “...The two party system forces the third party to join their group in a winner take all system...”
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"Sideshow in the streets: Spain’s prime minister has more to worry about than a general strike". Economist. 2010-09-30. Retrieved 2010-11-07.
Spain is a "de facto" two-party system. Other parties may influence policies if the government is in minority but, except for the Socialist and the Popular Parties, no other has, at the moment, any possibility of winning the elections. ...
Robert Marquand (March 11, 2008). "In Spain's elections, Socialists win with liberal appeal". Christian Science Monitor. Retrieved 2010-11-07.
The outcome also suggests that Spain, which has many small parties, is moving toward a greater two-party system – even as basic splits between right and left are deepening and becoming more contentious.
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... the standoff between the Federalists and their opponents, which led to the modern two-party system;
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Forty-eight states have the standard “winner-takes-all” electoral system: whichever presidential ticket amasses the most popular votes in a state wins all the electors of that state.
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The Pirate Party ... wants to legalise internet file-sharing and protect people's privacy on the net ... There *IS* a UK Pirate Party ... and there's a US ... one, and one in a few dozen others."
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In the nineteenth century, third parties were single-issue creatures that grew up around great causes that the major parties were ignoring. Abolition, women’s suffrage, and the direct election of senators all started as third-party movements.
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Certainly, there have been a whole lot of hung parliaments and slow-forming coalitions around the world lately. (Canada, Australia, Britain, the Netherlands, Iraq...)
Silvia Aloisi (Apr 15, 2008). "Election pushes Italy towards two-party system". Reuters. Retrieved 2010-11-07.
Italy's next parliament will have far fewer parties than the previous assembly, pushing the country closer to the two-party system that many commentators say is the only way to end years of political instability. ...
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Some argue that the winner-take-all mechanism in 48 states discourages independent or third party candidates from running because it would be difficult for them to get many electoral votes.
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And, as a result, more parties are represented in their parliament after the elections. The Italian Parliament, for instance, recently had more than 70 parties represented. ... These deals are cut with the smaller parties by offering them the chance to fill high government offices...
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