I’m an immigrant to the US - in my view, America is best thought of as a machine for turning other flavors of humans into Americans - the place really is inclusive in a way that I’ve never seen or heard of in any other country in the world. So calling it “American success” is not unreasonable, the secret is that you’re “an american” as soon as you get here and think of yourself as american. Compare that to England where I was born and grew up but people would laugh at you if you claimed to be “English” because you were brown.

I know “immigrant thinks america is great and welcoming” doesn’t fit the “make you angry so you click and share” narrative currently present online with regards to immigration, but it certainly fits the lived experience of myself and many immigrants I know, both legal and illegal.

[edit: forgot to write, I agree with you about the difficulty of starting a business in Europe vs the US, as well as maybe the cultural pressure in favor of running businesses in the US vs general attitude of discouragement in the UK. ]