My understanding is that Canada and Australia both have rapidly growing immigrant populations. Europe is also experiencing the same kind of southerly illegal immigrantion from Africa that the US has from Mexico and other parts of Latin America.

And I imagine that the USA would be on top of the index were it not for the 20,000 murders each year.

The best thing about America is, and always has been in my view, not the actual standard of living but the potential one. The fact that some guy can wash up on a Florida beach half dead with nothing more than the clothes on his back, then 10 years later he owns a thriving small business. Not too many places in this world that can happen!