I'm sure the slaves made such a huge increasable vast change in the future of the country that led to us being the dominant power in the world and Mexico being impoverished, not only that but our use of slaves 200 years ago is in fact the reason why Mexico ended up poor, because you know they did not use any slaves back then because they weren't allowed to and we were, so, yeah I guess that totally makes Mexico's situation totally our fault and we should just let everyone in Mexico move into the US and have our land take our jobs, use our schools, and hospitals, be rescued by our police and fire departments, vote in our elections, decide public policy, yes, lets let the Mexicans dictate our domestic policy, cause they sure did a better job in there country if it just wasn't for our damned slaves the roles would be reversed!
Well who do you think first kidnapped and whipped those slaves into working? It's harder than it looks, y'know!
that would be Africans by the way.