A map of the United States at the time of the Kansas-Nebraska Act (1854) which allowed settlers to determine whether or not slavery would be allowed in their territories. The map is color-coded to show the Free States (including California, admitted to the Union as a Free State in 1850), the Slave States, and the territories that were open to slavery by the Compromise of 1850. These territories were the Oregon Territory, Nebraska Territory, Minnesota Territory, Territory of Utah, Kansas Territory, Indian Territory, and the Territory of New Mexico.