Answer:
The "California Republic" was an unrecognized state that included the area north of San Francisco. This republic adopted the "bear flag" which is now used as the state flag of the state of California. The flag has a star, a grizzly bear and a red stripe. If California were to separate again, and it needed a national anthem, it could look something like this:
California, California, beautiful and strong,
I can never be away from you for very long.
Your sunny skies, your open sea, your brave history,
Make me proud to be a part of this glorious mystery.
With my fellow Californians, all sons of this land,
Through hardship, through blessings, proudly I stand.
