The Treaty of Guadalupe Hidalgo (1848) together with the Gadsden Purchase (1853) made Texas, California, and all the land between them officially part of the United States.
Treaty of Guadalupe Hidalgo can be regarded as one that is been signed on 1848, which is an agreement to bring an end to the war between the United States and Mexico.
This is where 55 percent of mexico territory is been ceded as well as :
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