You'd be fine with us going from a population of 3XX million to, say, 3 billion? I feel like there'd be a few problems with that. Can we annex other countries t

You'd be fine with us going from a population of 3XX million to, say, 3 billion? I feel like there'd be a few problems with that. Can we annex other countries then? I'm not trying to be facetious; I genuinely don't understand how "immigrants good" translates to "literally anyone who is willing to work should be allowed and there won't be any logistical issues because why would there be".