Already told you why rancheros wouldnt leave, and they wouldnt lose their land because the treaty had mexicans become american and thus their lands were protected by U.S law.
Also. 3 years later would actually have an INCREASE of mexican refugees fleeing mexico because of the deadly mexican revolution.
back to what ive been saying. mexicans have always been here. they didnt just vanish zero mexicans and then boom a random influx in the past 40 years like a puerto rican or cuban wave.
ask any black person from the great migration if its true mexicans were already here when we got here and they'd