Incidentally, when one person migrates from one place to another, they simply relocated - the total population didn't ‘increase’ because of it.
But I'll bet you already know that.
>> Incidentally, when one person migrates from one place to another, they simply relocated - the total population didn’t ‘increase’ because of it. <<
I get your point, but as worded, it’s not exactly true. Massive immigration from underdeveloped countries into developed countries delays the industrialization of the underdeveloped countries. In agrarian societies, families deliberately have huge families so that the parents will live off of the children’s labor s they get older. And anti-poverty programs usually only help poverty enough to maximize fertility, which naturally drops when parents are malnourished.
In the industrialized nations they move into, they depress wages of the middle class, creating increased government dependency and notions that married parents can’t “afford” another child, because they are ineligible for the benefits given to single parents.
So the effect of immigration, ironically is that the poor nations from which people immigrate see their populations rise faster, while the wealthier nations see their birth rates plummet.