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.
Republican Party of Wisconsin
The organizer of the meeting that gave birth to America's Republican Party was New York state native Alvan Earle Bovay, a lawyer and mathematics teacher at Ripon College. In 1852 Bovay traveled to New York City during the national Whig Party convention and met with old friend and "New York Tribune" editor Horace Greeley. Bovay suggested the name "Republican" for a new anti-slavery party that would replace the fading Whigs. He favored it because it was a simple word rather than a compound name like Free Soil or Free Democrat, that it could be used as either a noun or an adjective, that it would remind people of Thomas Jefferson's affiliation, and that it symbolized what he believed the new party should represent: "Res Publica," synonymous with "commonwealth". Bovay also believed that the name would attract immigrant voters that had recently fled monarchies.