Nonsense AOG !
Without immigration, America would be a vast, nearly empty country with nothing other than a few million white people with Anglo_Saxon roots and a few 100,000 native Americans.
It was all about Manifest destiny :::
https://en.wikipedia.org/wiki/Manifest_destiny
Tens of millions of people from all over Europe fled appalling conditions and civil war in order the build new lives across the Atlantic, and they are still arriving today. Despite what idiots like Trump says, America needs immigration in order to keep its economy going.
To suggest that Al Capone was representative of every Italian immigrant is breathtakingly ignorant, and the main reason why America has lots of blacks is because their ancestors were forcibly removed from their homes in Africa and transported to the New World, a great part of which involved the British, to our continuing shame.