War created the United States. There is no escaping that. America would not be possible without violence. Even Thomas Jefferson stated that the "tree of liberty must be refreshed from time to time with the blood of patriots and tyrants."

The British, French, and Spanish stole this land from the Native Americans (through war). We then stole a huge chunk from Britain (through war) and bought out the Spanish and French (and bought Alaska from Russia). We then stole the southwest and California from Mexico.

That's how America was formed. It is what it is. If Mexico wants the southwest back....they are welcome to declare war or make an offer to buy it. But we are never going to simply give it back to them. Just like we won't be giving the Northeast back to Britain.

I'm sorry...but that's how human civilization works.