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Today, there are two major political parties in the United States, the Democratic and the Republican. The Democratic Party evolved from the party of Thomas Jefferson, formed before 1800. The Republican Party was established in the 1850s by Abraham Lincoln and others who opposed the expansion of slavery into new states then being admitted to the Union.

The Democratic Party is considered to be the more liberal party, and the Republican, the more conservative. Democrats generally believe that government has an obligation to provide social and economic programs for those who need them. Republicans are not necessarily opposed to such programs but believe they are too costly to taxpayers. Republicans put more emphasis on encouraging private enterprise in the belief that a strong private sector makes citizens less dependent on government.

Both major parties have supporters among a wide variety of American and embrace a wide range of political views.Members, and even elected officials, of one party do not necessarily agree with each other on every issue.Americans do not have to join a political party to vote or to be a candidate for public office, but running for office without the money and campaign workers a party can provide is difficult.

Minor political parties - generally referred to as "third parties" - occasionally form in the United States, but their candidates are rarely elected to office. Minor parties often serve, however, to call attention to an issue that is of concern to voters, but has been neglected in the political dialogue. When this happens, one or both of the major parties may address the matter, and the third party disappears.

• Party System US Library of Congress, American Memory
• Political Parties - DOS IIP, Outline of American Government
• Political Parties in the United States - DOS IIP, U.S. Elections 2004
• Political Parties in the United States - DOS IIP, U.S. Elections 2004
• Political Parties - DOS IIP, Principles of Democracy
• [Political Parties] Politics Grolier Online

• Democratic Party
• Directory of U.S. Political Parties Politics1.com
• List of Political Parties in the United States Wikipedia
• National Political Index
• Political Organizations Links- DOD, Federal Voting Assistance Program
• Political Parties:National Party Website University of Michigan Document Center
• Republican Party
• Resources on Elections and Political Parties US Senate