Mexico keeps its original borders. What happens to the natives there?

Like it says on the tin. Suppose, for one reason or another, that Mexico doesn't lose Texas, California and everything in between those two places to the United States in the mid 19th century. Would the various Native American peoples be treated differently than they were by Washington as a whole, or would their ultimate fate be decided on a case by case basis?

For example, I can sadly see the California Genocide still occurring once the gold rush happens.
 
Like it says on the tin. Suppose, for one reason or another, that Mexico doesn't lose Texas, California and everything in between those two places to the United States in the mid 19th century. Would the various Native American peoples be treated differently than they were by Washington as a whole, or would their ultimate fate be decided on a case by case basis?

For example, I can sadly see the California Genocide still occurring once the gold rush happens.
The missionary system already in place in California was pretty genocidal in it's own right
 
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