The US is actually not doing well on a lot of individual parameters but if you look at everything as a whole it just ends up being a country with more opportunity than any other country and I would challenge you to find any country that's better than the US in those terms.
When it comes to healthcare geography and immigration is related because of the way a single payer social healthcare system works.
The US have to deal with immigration both legal and illegal. You can't just give 11mio illegal immigrants access to to healthcare just as people who immigrate much later haven't been paying to the system their whole lives.
Furthermore because of the distance if you want to provide equal treatment it's going to be very expensive or you have to spend a lot of money on transportation.
These are just some of the issues which normally gets completetly ignored but are actually crucial to understanding why the US can't be the same as European countries.
I happen to think that opportunities are bigger in the US because of less regulation, a bigger market with no language barriers and more venture capital and that the US could do even better if people didn't have to worry about hospital bills. There's a lot more potential.