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.
Republicanism in the United States
In 1792–93 Jefferson and Madison created a new "Democratic-Republican party" in order to promote their version of the doctrine. They wanted to suggest that Hamilton's version was illegitimate. According to Federalist Noah Webster, a political activist bitter at the defeat of the Federalist party in the White House and Congress, the choice of the name "Democratic-Republican" was "a powerful instrument in the process of making proselytes to the party. ... The influence of names on the mass of mankind, was never more distinctly exhibited, than in the increase of the democratic party in the United States. The popularity of the denomination of the Republican Party, was more than a match for the popularity of Washington's character and services, and contributed to overthrow his administration." The party, which historians later called the Democratic-Republican Party, split into separate factions in the 1820s, one of which became the Democratic Party. After 1832, the Democrats were opposed by another faction that named themselves "Whigs" after the Patriots of the 1770s who started the American Revolution. Both of these parties proclaimed their devotion to republicanism in the era of the Second Party System.