We have more than our fair share of these guys in the DC area. Virtually all of them here for any length of time have their own automobiles.
Then there are airplanes. They fly. I worked up the numbers some time back but it's easy to show that just the empty seats currently on airplanes over a 6 month period are sufficient to take all these guys to a border crossing.
Buses exist.
Food can be brought to stores along the routes. Portapotties are certainly available nationwide.
Just what is it about shipping out several million people that's not possible?
Check my last post to you. Our conversation is over.