The Arizona Territory was an organized territory of the United States that existed between 1863 and
1912, when the state of Arizona was admitted to the US. The territory was created after numerous
debates about splitting the New Mexico Territory. During the American Civil War, the United States
and the Confederate States had different motives for dividing the New Mexico Territory. Each claimed
a territory named Arizona that was a portion of the former New Mexico Territory. The two Arizona
territories played a significant role in the western campaign of the Civil War.