Can economics explain more than sociology or/and psychology?

They were heavily importing during the 80-90’s, providing $100k homes, jobs, and [liberal] voting tickets with instructions. I don’t know when they started nor do I keep track of the numbers. In California, the Mexicans migrate in huge numbers to the point that in Oregon, even further North, rather than teaching Canadian French (a close neighbor), the schools teach Spanish as a mandatory second language for the children.