Following the War of 1812, Delaware was unique in continuing to have a viable Federalist Party. Never tainted by the secessionist activities of the New England Federalists and adaptive enough to institute modern electioneering practices, they held the loyalty of the majority Anglican/Methodist downstate population against the seemingly more radical Presbyterians and Irish immigrants in New Castle County. They remained the dominant political force in the state well into the 1820s, when the party finally disappeared, split between an allegiances to Andrew Jackson or to John Quincy Adams and the "American system" of Henry Clay and the Whigs. New Castle County manufacturers joined most of the old Federalist Party leadership in making the Whigs the new majority in the state. This included McLane's mentor, James A. Bayard and various members of the Clayton family, especially Thomas Clayton and his cousin, John M. Clayton.