Take 4 other countries for example : Japan, Norway, Denmark and Finland...
These are also all highly homogenous ethnically and culturally. Norway, Denmark, and Finland have smaller populations that New York City. Japan has a radically different social-economic structure and traditions than any of these countries or the USA.
This is probably my ENTP devil's-advocate streak kicking in, since (1) I agree with almost everything you're saying, (2) I'm tickled pink that someone else is arguing the case I've been arguing here, and doing it so well, and (3) I'm always tickled to see someone mention Finland, but still...
Yeah, I think the USA could learn some things from these (and other) countries, if it bothered to look, but it's also dangerous to tout their examples as patent medicine that might taste bitter but that'll work if you just hold your nose and swallow it.
Finland, for example, is a very peculiar country in some economically significant ways. We have an extremely strong tradition of national solidarity -- we see ourselves as small and isolated, and are very wary of trusting to any outside power to do anything for us.
That shows in some ways that are silly and counterproductive (e.g. our attitude towards agricultural self-sufficiency), and some that are not so silly (e.g. our system of state representatives, industry representatives, and union representatives sitting down every year to hammer out a general agreement on mandatory terms of employment). We've had perfectly stable coalition governments that include everyone from the National Coalition (the Conservative party) to the Left Alliance (basically what's left of the Communist party since the USSR went tits-up). That's highly unusual: Sweden has a similar political system and rather similar culture, but there's no way they could get even the center-right and center-left parties to share a government, let alone the genuine left and right.
So, again, Arpyjee -- I salute you for what you're doing, but I'd also like to add that while the US could (and IMO should!) look for lessons, ideas, and models in other countries, it's very, very important to understand what makes their solutions work. For example, I very much doubt it would be possible to have anything resembling the Finnish trilateral labor negotiations in a country as big as the US, or even as big as California.