William H. Seward
The Republican Party had been founded in 1854, in reaction to the Kansas-Nebraska Act. Its anti-slavery stance was attractive to Seward, but he needed the Whig structure in New York to get re-elected. In September 1855, the New York Whig and Republican parties held simultaneous conventions that quickly merged into one. Seward was the most prominent figure to join the new party, and was spoken of as a possible presidential candidate in 1856. Weed, however, did not feel that the new party was strong enough on a national level to secure the presidency, and advised Seward to wait until 1860. When Seward's name was mentioned at the 1856 Republican National Convention, a huge ovation broke out. In the 1856 presidential election, the Democratic candidate, former Pennsylvania senator James Buchanan, defeated the Republican, former California senator John C. Frémont, and the Know Nothing candidate, former president Fillmore.
History of the United States (1789–1849)
The First Party System between 1792 and 1824 featured two national parties competing for control of the presidency, Congress, and the states: the Federalist Party was created by Alexander Hamilton and was dominant to 1800. The rival Republican Party (Democratic-Republican Party) was created by Thomas Jefferson and James Madison, and was dominant after 1800. Both parties originated in national politics but moved to organize supporters and voters in every state. These comprised "probably the first modern party system in the world" because they were based on voters, not factions of aristocrats at court or parliament. The Federalists appealed to the business community, the Republicans to the planters and farmers. By 1796, politics in every state was nearly monopolized by the two parties.