When did California become a state?

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California joined the union on the 9th of September 1850, as the 31st state.
California became part of the US in 1846 when they conquered it during the Mexican War and then became a US State in 1850.
It became a part of the US as a result of the Treaty of Guadalupe Hidalgo signed on 2 February 1848 ending the Mexican American War. It was admitted to the Union as a state on 9 September 1850.
As part of the 1850 Compromise.

In exchanging for allowing California to join the Union as free soil, the South was allowed two more slave-states, and a rigorous enforcing of the Fugitive Slave Act.
09 September 1850.

Answer

Bennet Riley, the US military governor, called a meeting along with forty-eight other delegates and wrote the California Constitution. Then, the US government ratified the constitution and California became the 31st state September 9th, 1850.
California has been a state of the United States since Sep 9th,1850. Prior to that it was briefly the Californian Republic after declaring independence from Mexico.

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First answer by ID1451301295. Last edit by Kmooney16z. Contributor trust: 3 [recommend contributorrecommended]. Question popularity: 98 [recommend question].