La Raza meaning "the Race" of course. They believe that they are going to take swaths of land from the United States. Allowing people to live here who obviously do not have the best intentions for America.
See "Fall of the Roman Empire" for details.
I propose this:
Offer them the land they want on the condition that the land is returned to them in the condition it was in before the arrival of the White Devil. That means no cities, no roads, no airports, no industry, no government, no schools, no jobs, no welfare.
If they don't accept those terms, they have to go back to Mexico.