How many Americans are there in Mexico, and how many Mexicans are in the United States of America? Bonus points if you compare "legally" and "illegally" separat

How many Americans are there in Mexico, and how many Mexicans are in the United States of America? Bonus points if you compare "legally" and "illegally" separately! I think that there's a lot of Americans that would take the "everyone goes back home" trade in a heartbeat. (Complaining about tourists is a time honored tradition among locals everywhere, of course - it's just a bit ironic to me here)