I can't understand why any American would be against having a border wall. What's the downside?

But I also think we should just take over Mexico, too. They want in? Sure - we'll take 'em all. Move the southern border to Guatemala/Belize, replace their corrupt bums with some of our corrupt bums, run out the cartels and start re-building the place. There'd be plenty of jobs to go around for quite a while. And just THINK of all that beachfront property! Guys! SO MANY JOBS!!!