The Struggle to Become a State - Desiree Mason By DesViolet May 30, 1848 Signing of the Treaty of Guadalupe Hidalgo The Mexican American War ends with the signing of the Treaty of Guadalupe Hidalgo. http://www.history.com/topics/treaty-of-guadalupe-hidalgo Jun 20, 1850 New Mexico becomes a Territory of the United States As part of the Compromise of 1850, New Mexico becomes a territory of the United sates.
