Something similar has long happened even within EU countries.
Gregory Clark was giving talks about historical data on this in England, looking roughly for signals of people who were born in the north, got rich, and tended to move south -- as many did.
Gregory Clark was giving talks about historical data on this in England, looking roughly for signals of people who were born in the north, got rich, and tended to move south -- as many did.
https://voxeu.org/article/decline-northern-england-1780-2018
He goes so far as to claim that this migration has been strong enough to explain much of the present economic differences between north & south.