June 1846
California was acquired from Mexico at the end of the Mexican-American War (1846-1848). Since then, southern California has been part of the US-Mexico Border.
California
Mexico in the Treaty of Guadalupe Hidalgo.
Both states were acquired from Mexico by the means of war due to such ideal.
The Mexican States of Alta California and Nuevo Mexico.
Mexico
California was acquired from Mexico at the end of the Mexican-American War (1846-1848). Since then, southern California has been part of the US-Mexico Border.
California
Mexico in the Treaty of Guadalupe Hidalgo.
California, Texas and parts of Arizona and New Mexico.
All of them were acquired form Mexico.
Both states were acquired from Mexico by the means of war due to such ideal.
The Gadsden Purchase from Mexico was made while Pierce was president.
California and the Southwest.
President Polk offered to buy New Mexico and California from Mexico.
The Mexican States of Alta California and Nuevo Mexico.
There were no rebels in California who wanted to become "Californians". California was acquired from Mexico by American troops. See related questions for more detail.