@layman,
At one time Spain "claimed" title to land reaching all the way into Canada. They had absolutely no presence in, or control of this land.
Spain later transferred this bogus "deed" to Mexico.
Along about 1845, we destroyed Mexico City, and they "gave" it to us.
They've hated us ever since.
But we didn't rely on no fake-ass titles. We kicked Comanche and Apache ass, who had been roughing up Mexico for decades, and kicked their sorry ass OUT.
That's why we have "title" to it. Mexico didn't give us ****.