Two-party system
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.
Party switching in the United States
The first two major parties in the United States were the Federalist Party and the Democratic-Republican Party. The Federalists experienced success in the 1790s but lost power in the 1800 elections and collapsed after the War of 1812. Many former Federalists, including John Quincy Adams, became members of the Democratic-Republican Party. After the 1824 presidential election, the Democratic-Republicans fractured between supporters of Adams and supporters of Andrew Jackson. Jackson's followers formed the Democratic Party, while those who supported Adams formed the National Republican Party. Two short-lived but significant third parties, the Anti-Masonic Party and the Nullifier Party, also arose during this period. In the 1830s, opponents of Jackson coalesced into the Whig Party.