|Historically, the American Party has had a number of existences. Chronologically, the more important of them were:
1843--1856: The American Party was a nativist party, with strength throughout the nation. It won many races in the early 1840s, particularly in cities. In several states, it was originally known as the Native American Party. Its 1847 national convention in Philadelphia adopted the name American Party but allowed state affiliates to retain their local names. The party received a boost when the Know Nothing movement began in the early 1850s and raised the party to a major force nationally. The party divided in 1856, when most of its northern adherents joined the Republicans. The party remained the opposition party to the Democrats in several southern states until the Civil War. National conventions: 1848 , 1852 , 1856 .
1886--1891: A fleeting American Party was in existence, nominating national tickets which ran under several different labels in different states.
1906--1910: An American Party was active in Utah
1914--1916: An American Party was active in New York State (it ran a slate of electors pledged to Charles E. Hughes in 1916)
1920, 1924: The label "American Party" was used for the independent candidacies of James Ferguson and Gilbert Nations.
1968-1996: The American Party was one of the names of state affiliates of the George Wallace campaign. After the 1972 election, the different state affiliates divided into two parties, usually called the American and American Independent Parties but with state affiliates sometimes using different names. The American Party candidates for president and vice president last appeared on the ballot in 1996 although they held national conventions in 2000, 2004, and 2008. National conventions (lots of details here): 1976, 1980, 1984, 1988, 1992, 1996, 2000, 2004, 2008.
2013-2018: A third party called the American Party is active in South Carolina. The party seeks to elect moderate candidates. That party changed it's name to the Alliance Party.