A map of the United States and territories in 1861 at the outbreak of the Civil War. The map is color-coded to show the Union Free States, the Confederate States seceded before April 15, 1861, the Confederate States seceded after April 15, 1861, the Union Slave Holding States, and the territories controlled by the Federal Government. The heavy line shows the limit of territory held by the Confederates. The territorial boundaries shown include the Indian Territory (Oklahoma), and the territories of Washington, Dakota, Nevada, Utah, Nebraska, Colorado, and New Mexico at the time.