“The southern border with Mexico would also disappear.”
LOL.
Well Comrade from your location you probably have no idea how long the Mexico/US border is. The length was one reason why President Trump had a hard time getting it fenced even though 1,000 miles already had been. It is certainly a reason he wanted Mexico to pay for it. Given all the nuclear fantasies projected for use of nukes at this post, there are hardly enough functioning Russian nukes to make the southern border disappear or the northern one either for that matter. I have crossed both borders in several places, and I can personally testify that distances are VERY LONG.