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On March 2, 1861 Dakota Territory was split from Nebraska Territory, and included the unorganized remaining land from former Minnesota Territory. Dakota Territory consisted of both present-day North and South Dakota, as well as most of Montana and northern Wyoming. Nebraska Territory was formed out of land from the Lousina Purchase.

States    Territories  Confederacy  Disputed areas

  

On March 4, 1863 Idaho Territory was created from portions of Washington Territory, Dakota Territory, and Nebraska Territory. (see green arrows on map)

States    Territories  Idaho Territory  Confederacy  Disputed areas

  

On May 26, 1864 Montana Territory was split from Idaho Territory, which also had some land retransferred to Dakota Territory. (see green arrows on map)

States    Territories  Montana Territory  Confederacy  Disputed areas

  

On July 25, 1868 Wyoming Territory was formed from portions of Dakota Territory, Idaho Territory, and Utah Territory. (see green arrows on map)

States    Territories  Wyoming Territory  Disputed areas

  

On March 28, 1882 the part of Dakota Territory south of 43rd parallel and north of the Keya Paha and Niobrara River was transferred to Nebraska. On November 2, 1889 the Dakota Territory was split in two, and it was admitted as the 39th state, North Dakota, and 40th state, South Dakota.

States  Territories  Disputed areas