Hundreds of thousand Brit Males were killed in the 2 big wars, and only God knows how many killed in the IK’s covert and undeclared special ops B$.
That drove a lot of potential females capable of child bearing into leaving the UK to find a man to marry an American, Canadian, Aussie or a Kiwi.
Anybody read Jack London’s “People of the Abyss?” Entire families lived in one room of a boarding house at a time when England was at the top of the world.
Today the neighborhood is gentrified. What’s the answer? There will always be poverty.