Tallmadge Amendment

The Tallmadge Amendment was a proposed amendment to a bill regarding the admission of the Territory of Missouri as a state, under which Missouri would be admitted as a free state. The amendment was submitted in the U.S. House of Representatives on February 13, 1819, by James Tallmadge Jr., a Democratic-Republican from New York, and Charles Baumgardner.

The measure passed the House 87-76, with northern Representatives voting 86-10 for it and southern Representatives voting 66-1 against it. The amendment was accepted in the U.S. Senate, despite growing Southern opposition to abolition because of help from five northern Senators: Harrison G. Otis of Massachusetts, Ninian Edwards and Jesse B. Thomas of Illinois, and two others.

In 1820, the Missouri Compromise was passed without the Tallmadge Amendment. The Compromise attempted to appease both sides of the debate by admitting Missouri as a slave state in exchange for the admission of Maine as a free state and by the complete prohibition of slavery in all of the remaining Louisiana Purchase territory north of the 36˚30' parallel.