The Treaty of Guadalupe Hidalgo in 1848 after the end of the Mexican-American war.
1848 by us pres. James Polk
The Texas annexation purchased the Mexican cession.
The Mexican Cession was acquired in 1848 at the Treaty of Guadalupe Hidalgo.
Indeed. However, it is not called 'secession' but "Mexican Cession".
The Mexican-American War, and the resulting Mexican Cession, were during the presidency of James K. Polk.
It gave us the Mexican Cession.
1848
The states that acquired all of their present-day land from the Mexican Cession are California, Nevada, Utah, and parts of Arizona, New Mexico, Colorado, and Wyoming. The Mexican Cession occurred after the Mexican-American War, when Mexico ceded a large portion of its territory to the United States in 1848. While some states, like California and Nevada, derive their entire area from this cession, others only partially do.
The United States did want the Mexican cession because they wanted to govern and control their own resources.
The Mexican Cession
1848
Mexican Cession