Actually many Mexicans believe a large chunk of this country should be theirs. They believe it was stolen by us and they have every right to live here and even take it back. Some claim they are even taught this in their schools.
They do not understand/accept that the land was won in battle, and purchased. They think because it once was theirs they still have some claim on it.
sounds like islamics.
I’m well aware of what Mexicans think and the present day American Southwest was NEVER part of Mexico. Spain controlled it. Prior to that the Mayan and Aztec Empires never extended any further north than present day Mexico City. Any attempts by Aztecs to come further north across the Rio Grande were violently repulsed by the native peoples here.