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.
History of the United States Republican Party
The South's transition to a Republican stronghold took decades and manifested an incremental seepage downward from national to state to local levels. First the states started voting Republican in presidential elections—the Democrats countered that by nominating Southerners who could carry some states in the region, such as Jimmy Carter in 1976 and Bill Clinton in 1992 and 1996. However, the strategy narrowly failed with Al Gore in 2000. The states began electing Republican senators to fill open seats caused by retirements and finally governors and state legislatures changed sides.