California was not originally part of Mexico.
But I have some questions. When you say Latino culture, I am going to assume you are not talking about the Latin culture that dates back to the Roman Empire from which all Latino Culture draws.
Then again, are you talking about the European colonial culture that seeded it, or the pre-Columbian cultures, African slaves, the other European cultures that expanded it's populations, or the eastern immigrants that influenced the culture seeded by the others.
Or are you talking about the people whom live here today and call themselves "Latino"?
Actually the only culture that is brutally important to the present and to the future, is that of being a Californian and an American. The others, they're history.I say Disney needs to do a better job at including a culture that is brutally important to its past and present.