Jefferson Territory
Auraria ceased to exist as a separate town on December 3, 1859, when the Jefferson Territory granted a charter to the consolidated City of Denver, Auraria, and Highland, which would come to be known as just Denver City, the territorial capital and seat of Arrappahoe County. The Jefferson Territory was itself superseded on February 28, 1861, when U.S. President James Buchanan signed An Act to provide a temporary Government for the Territory of Colorado.