California was first settled by the Spanish and was included in its colony of Nueva España. Upon this colony's independence in 1821, it formed into Mexico. So at this time, Mexico included California. However, Mexico's neighbor, the USA was going through some high levels of nationalism at this time and was looking to expand from sea to sea. The US went to war with Mexico in 1848 (the Mexican-American War) for land, ended up winning, and acquired 1/3 of Mexico's land (what is now the Western US). So technically, California was acquired from the Mexicans.
The United States conquered California in 1847, which had been a Mexican territory up to that time.
As spoils of war.
When The present day states of California Nevada and Utah were acquired in 1848 from
From which country did the United States acquire 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.
All of them were acquired form 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, Texas and parts of Arizona and New Mexico.