File:Flag of Californio-America.svg

The flag of the California Republic Californio-America, nearly identical to the flag of the state of California with the exception of three stars instead of one and seven bars instead of one whole singular bar.

Credit to Devin Cook from Wikimedia Commons for the vector of the California state flag, which I edited to add the two extra stars and divide the bar at the bottom into seven separate bars, in order to match the country flag seen in-game.