Most of the So-Cal immigrants are straight from Mexico (in modern history) and not the native hold overs from Spanish conquest. The amount of Spanish speakers i

Most of the So-Cal immigrants are straight from Mexico (in modern history) and not the native hold overs from Spanish conquest. The amount of Spanish speakers in California that can trace their ancestry to that period of time is incredibly small. California was pretty sparse and largely why the purchase was allowed. It wasn't seen as a valuable piece of territory and the Spanish never had much success there.