Sure we "stole" much of the American Southwest from Mexico, right after they "stole" it from Spain, who "stole" it from the Navajo, Zuni, Hopi, Apache, and Comanche, who "stole" it from the Anasazi and Sinagua, who "stole" it from whoever preceded them. We may need a Cultural Anthropologist to tell us what ancient tribe actually own it, but my feeling is it belongs to the snakes, lizards, and antelopes that still live there.