>What proportion of mail comes from them and what from developed nations with whom we'll need to come to new agreements, drastically increasing the friction of

>What proportion of mail comes from them and what from developed nations with whom we'll need to come to new agreements, drastically increasing the friction of overseas shipping to everyone involved? I don't see the problem here, nor why the proportion matters at all. The simple fact is that shipping from the US to anywhere else in the world costs a fortune. So flipping the table can't possibly make it any worse.