Editing Gadsden Purchase (section)

=== Civil War ===
In 1861, during the [[American Civil War]], the [[Confederate States of America]] formed the [[Confederate Arizona|Confederate Territory of Arizona]], including in the new territory mainly areas acquired by the Gadsden Purchase. In 1863, using a north-to-south dividing line, the Union created its own [[Arizona Territory]] out of the western half of the New Mexico Territory. The new American Arizona Territory also included most of the lands acquired in the Gadsden Purchase. This territory would be admitted into the Union as the [[Arizona|State of Arizona]] on February 14, 1912, the last area of the [[Contiguous United States|Lower 48 States]] to receive statehood.