"They" didn't live on the land. "They" never did.
Ancestors of theirs might have. Ancestors of a lot of people in the US. Even people who don't call themselves hispanic or even know of any Mexican heritage.
How do we propogate it to the middle east? If they can't settle it with law or money - use force. I don't particularly care. I don't live there. And it isn't our job to fix it.