Republican Party Logo Republican Presidents of the United States of America

Founded in 1854 by anti-slavery activists, economic modernizers, ex-National Republicans, ex-Free Soilers and Whigs, the Republican Party, often referred to as the GOP (Grand Old Party) is named after republicanism, a major ideology of the American Revolution.

It dominated politics at the federal level and in the majority of northern states between 1860 and 1932 though it changed its ideology around the turn of the 20th century to become the major conservative or right leaning party of the United States of America, effectively swapping ideologies with its rival, the Democratic Party.