Earlier quoted context omitted.
this is a bad take 1. the us had open borders because they could offer land to people coming in, it had economic benefits for everyone involved. nowadays, EVERYONE wants to get in, especially actors with bad intentions, and as was just shown in europe not even five years ago now, open borders are a terrible idea with long lasting consequences. 2. economic growth does not simply derive from a larger population, there'…
There's really no substance to anything you've said here. Just confusion and fears and basic misunderstanding of economics and geopolitics. Please consult any economist or international relations scholar on point 2 or 3.
for the past few thousand years, you risked your life by traveling. if someone went around looking for slaves to sell and you found yourself clamped in iron, your life was over