Political protest against immigrants has come to a head several times in American history. The most famous and influential such protest was exemplified by the Know-Nothing Party, founded in 1854 and directed especially against Catholic immigrants. By the end of 1855 the party had elected eight governors, over one hundred Congressmen, and thousands of local officials. Prominent politicians of every persuasion joined the party, which then changed its name to the American Party. It; became a major element in the new Republican Party, which first produced a presidential candidate in 1856. The party and its influence has not attracted much attention from historians, because the events involved in the coming of the Civil War eclipsed interest in a movement that was only; peripherally involved with Civil War issues.; The Know-Nothings had a precipitous decline, starting with the 1856 election, at which their presidential candidate Millard Fillmore carried only one state. The Republican Party soon eclipsed it, too. Tyler Anbinder has written the first comprehensive history of the Know-Nothings, and his book represents a major revision of historiography in the years leading up to the Civil War.

The 1850s saw in America the breakdown of the Jacksonian party system in the North and the emergence of a new sectional party--the Republicans--that succeeded the Whigs in the nation's two-party system. This monumental work uses demographic, voting, and other statistical analysis as well as the more traditional methods and sources of political history to trace the realignment of American politics in the 1850s and the birth of the Republican party. Gienapp powerfully demonstrates that the organization of the Republican party was a difficult, complex, and lengthy process and explains why, even after an inauspicious beginning, it ultimately became a potent political force. The study also reveals the crucial role of ethnocultural factors in the collapse of the second party system and thoroughly analyzes the struggle between nativism and antislavery for political dominance in the North. The volume concludes with the decisive triumph of the Republican party over the rival American party in the 1856 presidential election. Far-reaching in scope yet detailed in analysis, this is the definitive work on the formation of the Republican party in antebellum America.