Yes, California entered the Union prior to the Civil War.
No, it wasn't even a state.
1850; Union
No, Montana wasn't a state, but Oregon and California were, and were both fighting on the Union side.
which state provided 90 percent of the south's cooper during the civil war
Well, I believe that California was not yet a state at the time of the Civil War. So, in other words, California was neither.
California was a Union State during the Civil War.
No, it wasn't even a state.
California.
California
1850; Union
No, Montana wasn't a state, but Oregon and California were, and were both fighting on the Union side.
California.
Minnesota was a Union State during the Civil War.
California remained loyal to the Northern Union during the US Civil War.
No wars in either state. California did have Union troops stationed in the Central Valley during the Civil War, but none of the events in the war extended to the western states.
No Civil War battles of consecuence were fought in California.
which state provided 90 percent of the south's cooper during the civil war