The Acceptance of Missouri (August 10th)

In 1812, land in the Louisiana Territory south of the thirty-third parallel became the state of Louisiana. Because the Louisiana Territory no longer contained Louisiana, the territory was renamed the Missouri Territory. The territory began to earn some legislative rights. Every 500 citizens were allowed to select one representative for the territorial House of Representatives. The territory also elected one delegate for the US House of Representatives.

During the War of 1812, many British and Native American attacks took place within the Missouri Territory, mainly the lands around the Missouri and Mississippi River.

In November of 1818, Missouri's territorial legislature adopted a request for statehood, which was submitted to the US Congress in December of that year. Normally, Missouri would have been accepted, but the Missouri's admission would have upset the balance between slave and free states because Missouri applied as a slave state. In 1820, Missouri entered the Union as a slave state in the Missouri Compromise. In the compromise, Missouri would enter as a slave state and Maine would be admitted as a free state. On August 10th, 1821, Missouri was admitted as the 24th state.

Missouri became the only slave state north of the 36°30′ line due to the agreement struck in the Missouri Compromise. This agreement and the admittance of Missouri started the build-up to the Civil War.