As part of the Compromise of 1850, the Fugitive Slave Act was amended and the slave trade in Washington, D.C

The Kansas-Nebraska Act repealed the Missouri Compromise, created two new territories, and allowed for popular sovereignty

Admitted Missouri as a slave state and Maine as a free state.

The Louisiana Purchase eventually doubled the size of the United States

Manifest Destiny, a phrase coined in 1845, is the idea that the United States is destined—by God

On May 13, 1846, the United States Congress declared war on Mexico after a request from President James K. Polk.