The Republican Party, also known as the Grand Old Party (GOP), is one of the two major political parties in the United States. Founded in 1854, it is the older of the two parties by name recognition of its nickname but the younger of the two in founding date, having emerged from the collapse of the Whig Party and the broader anti-slavery movement. The party nominates candidates for federal, state, and local offices and currently serves as one of the principal governing coalitions in American politics alongside the Democratic Party.

The Republican Party's ideological profile has shifted substantially over its history. In its founding era, the party was associated with opposition to the expansion of slavery, high tariffs to protect domestic industry, and federal investment in infrastructure. Through the mid-20th century it became associated with fiscal conservatism, limited government, and anti-communism. Since the 1980s the party has been broadly identified with lower taxes, deregulation, skepticism of federal social programs, social conservatism on issues such as abortion and same-sex marriage, and a strong national defense. The election of Donald Trump in 2016 and again in 2024 accelerated an internal realignment toward economic nationalism, skepticism of free trade, restrictionist immigration policy, and a more populist and working-class electoral coalition. Whether this represents a durable transformation or a contingent shift remains actively debated within and outside the party.

The party's base has shifted demographically in recent decades. Traditionally strong among college-educated suburban voters and business interests, the GOP has made gains among working-class voters across racial lines while losing ground in some affluent suburban districts. The extent and permanence of these changes are subjects of ongoing analysis.

The party is formally organized through the Republican National Committee (RNC), which coordinates national elections, fundraising, and party rules. Each state has its own Republican Party organization. Presidential nominees are selected through a primary and caucus system culminating in the Republican National Convention, held every four years. The party holds seats across the federal government, including the presidency, both chambers of Congress, and a majority of state governorships and legislatures as of 2025.

The party is internally divided on several significant questions, including the proper scope of executive power, the future of entitlement programs such as Social Security and Medicare, the degree of continued support for Ukraine, trade policy, and the relationship between traditional social conservatism and the newer populist wing associated with Trump. These fault lines do not always map cleanly onto establishment-versus-insurgent or moderate-versus-conservative distinctions. See Republican Party - Debate for detailed treatment of internal and external contested questions.

The party is commonly associated with a founding meeting in Ripon, Wisconsin in 1854, though some historians give Jackson, Michigan equal or greater weight as the founding site; it drew together former Whigs, Free Soilers, and anti-slavery Democrats. Its first successful presidential candidate was Abraham Lincoln in 1860. The party dominated national politics through most of the post-Civil War period before facing strong competition in the 20th century. For full historical treatment, see Republican Party - History.

There is no significant scholarly or political science consensus on the long-term ideological trajectory of the party post-2016, or on whether the populist realignment represents a stable coalition. Areas of broad agreement include basic historical facts of the party's founding and electoral record. See Republican Party - Political Science Consensus for documented areas of agreement.

• Traditional Conservative Viewpoint - Holds that the party's core mission is limited government, fiscal responsibility, constitutional originalism, and social conservatism grounded in religious and civic tradition.
• National Populist Viewpoint - Holds that the party should prioritize economic nationalism, immigration restriction, skepticism of globalist institutions, and direct representation of the working class over corporate and donor interests.
• Libertarian-Leaning Viewpoint - Holds that the party should return to or strengthen its commitment to free markets, civil liberties, non-interventionism, and reduced government across all domains including social ones.
• Never Trump / Reform Conservative Viewpoint - Holds that the party under Trump has abandoned principled conservatism, constitutional norms, and democratic integrity, and requires either reformation or replacement.
• Progressive Critique Viewpoint - Holds that the party systematically represents the interests of the wealthy and white majority at the expense of marginalized groups, and that its current form is authoritarian in character.
• Center-Left Critique Viewpoint - Holds that the party has moved too far from the political mainstream and that its policy positions on taxation, social programs, and democratic norms are inconsistent with majority public preferences.

• Republican Party - History
• Republican Party - Debate
• Republican Party - Political Science Consensus
• Democratic Party
• United States of America
• American Conservatism
• Libertarianism
• Fiscal Conservatism
• MAGA Movement
• American Political Parties

1. Gienapp, William E. The Origins of the Republican Party, 1852-1856. Oxford University Press, 1987.
2. Perlstein, Rick. Before the Storm: Barry Goldwater and the Unmaking of the American Consensus. Hill and Wang, 2001.
3. Skocpol, Theda, and Vanessa Williamson. The Tea Party and the Remaking of Republican Conservatism. Oxford University Press, 2012.
4. Sides, John, Michael Tesler, and Lynn Vavreck. Identity Crisis: The 2016 Presidential Campaign and the Battle for the Meaning of America. Princeton University Press, 2018.
5. Confessore, Nicholas, and others. “How the G.O.P. Coalition Is Shifting.” New York Times, various editions, 2020-2024.