Political parties similar to or like Republican Party (United States)

One of the two major political parties in the United States. Second-oldest extant political party in the United States; its chief rival, the Democratic Party, is the oldest. Wikipedia

One of the two major contemporary political parties in the United States, along with its main, historic rival, the Republican Party. Founded around 1828 by supporters of Andrew Jackson, making it the world's oldest active political party. Wikipedia

Generally based on American conservatism, in contrast to the social liberalism of the Democrats. The party consists of moderates, sometimes described as establishment Republicans, and members of the Tea Party or Freedom Caucus, who have been described as populist, right-wing, and far-right. Wikipedia

Political party in the United States that promotes civil liberties, non-interventionism, laissez-faire capitalism, and limiting the size and scope of government. Conceived in August 1971 at meetings in the home of David F. Nolan in Westminster, Colorado, and was officially formed on December 11, 1971 in Colorado Springs, Colorado. Wikipedia

Federation of Green state political parties in the United States. The party promotes green politics, specifically environmentalism; nonviolence; social justice; participatory democracy, grassroots democracy; gender equality; LGBT rights; anti-war; anti-racism and eco-socialism. Wikipedia

Historians debating the origins of the American Civil War focus on the reasons why seven Southern states (followed by four more after the onset of the war) declared their secession from the United States (the Union), why they united to form the Confederate States of America (simply known as the "Confederacy"), and why the North refused to let them go. While virtually all historians in the 21st century agree that conflicts over slavery caused the war, they disagree sharply regarding which kinds of conflict—ideological, economic, political, or social—were most important. Wikipedia