When was the U.S. Republican party formed?
History of the United States Republican Party
March 20, 1854
The first anti-Nebraska local meeting where Republican was suggested as a name for a new anti-slavery party was held in a Ripon, Wisconsin schoolhouse on March 20, 1854.[6] The first statewide convention that formed a platform and nominated candidates under the name Republican was held near Jackson, Michigan on July 6, 1854. It declared their new party opposed to the expansion of slavery into new territories and selected a statewide slate of candidates. The Midwest took the lead in forming state party tickets while the eastern states lagged a year or so. There were no efforts to organize the party in the South, apart from St. Louis and a few areas adjacent to free states. The party initially had its base in the Northeast and Midwest.