The US had a war with Mexico. The US Army defeated the Mexican Army in several engagements and entered the capital, Mexico City. The USA got California in the Treaty of Guadalupe Hidalgo.
Mexico
When The present day states of California Nevada and Utah were acquired in 1848 from
June 1846
From which country did the United States acquire California
California
Mexico in the Treaty of Guadalupe Hidalgo.
California was a part of Alta California, a region of Mexico that the US acquired as a result of the Mexican-American War. This area wasn't annexed but was ceded.
The Mexican States of Alta California and Nuevo 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.
All of them were acquired form Mexico.
California
California, Texas and parts of Arizona and New Mexico.