Adams–Onís Treaty, 1819.
American Civil War, 1861–1865. New Mexico Territory in the American Civil War. ...
Compromise of 1850.
Gadsden Purchase, 1853/1854.
Governors of the Territory of New Mexico.
History of New Mexico.
Mexican–American War, 1846–1848. ...
Territorial evolution of the United States.
There's more to it but U can guess which ones (:
Hopes this helps!
