February 24, 1863: On this date, Arizona became its own territory. Prior to this Arizona was part of the territory of New Mexico. This new territory was created during the Civil War when the Confederacy was attempting to divide the territory with a border running through the middle in an east-west direction. The South hoped to gain control of the southern portion of this territory, which would lead to access to the Pacific Ocean. By dividing Arizona and New Mexico with a border that ran north and south the government denied Confederate claims to this southern territory.