Answer:
merican politics operate on a two-party system, meaning that two major political parties dominate voting in most elections and consequently dominate elected offices. In modern United States elections, the two major parties are the Democratic and Republican parties. These parties are associated with liberal and conservative views respectively, and nearly all elected officials are affiliated with one of the two. Campaign endorsements, funding, and resources are allocated to candidates on the basis of nomination by one of these two parties.
Although the American political structure has consistently been a two-party system, third parties occasionally influence elections, and third party candidates sometimes obtain elected positions. “Third party” technically refers to the third largest party in a two-party system, but in the U.S. it generally refers to any party running in an election other than the major two. Many third parties have gained some traction throughout American history — at one point, the Socialist Party held 600 mayoral offices, and Theodore Roosevelt obtained a signifiant number of votes in his presidential bid as the Progressive Party candidate in 1912. Today, the largest three “third parties” as measured by the number of registered voters affiliated with them are the Libertarian Party, the Green Party, and the Constitution Party. None of them hold a substantial number of public offices.
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