Massachusetts Republican Party
The Massachusetts Republican Party was founded in 1854. Drawing together abolitionist and nativist anti-Catholic elements, it quickly became the dominant political force in the state and a powerful arm of the national Republican Party. Significant founding figures include Senator Charles Sumner, formerly of the Free Soil Party, and Speaker of the House Nathaniel Prentiss Banks, formerly of the American Party. 
At the time of the Republican Party's founding in 1854, all of Massachusetts's congressional representatives but Sumner were members of the nativist Know-Nothing Party. However, Banks's role as chairman of the 1856 Republican National Convention, his active support for the Republican presidential nominee John C. Frémont in 1856 and his focus on anti-slavery legislation as Speaker put him at odds with his party. Following the Democratic victory in the 1856 elections and the Dred Scott case in 1857, the national American Party organization collapsed, and most Northern members joined the nascent Republicans. In 1857, Banks ran as a Republican against incumbent Know-Nothing Governor Henry J. Gardner and won a decisive victory.
American Republican Party (1843)
The American Republican Party was a minor nativist political organization that was launched in New York in June 1843, largely as a protest against immigrant voters and officeholders. In 1844, it carried municipal elections in New York City and Philadelphia and expanded so rapidly that by July 1845 a national convention was called. This convention changed the name to the Native American Party and drafted a legislative program calling for a twenty-one-year period preceding naturalization and other sweeping reforms in the immigration policy. Failure to force congressional action on these proposals, combined with the growing national interest in the Mexican problem before the Mexican–American War, led to the party's rapid decline.