The problem with America is that there's people in it like you who think it's the best. I think a lot of what you're saying was true once. However, the US has stagnated, and allowed itself to become arrogant and stupid. Just look at our president, our education system compared to other countries, our horrible environmental track record, the lack of true separation of church and state, and our lack of innovation in technology (outside of Apple anyway.)
It's not about what country is "best," we need to stop thinking in terms of competing with other nations, and more in terms of working with them. North Korea has a lot in common with us - a stupid, crazy leader, and a lot of arrogance, combined with hostile military ambitions.
We're still a great country, but when I look at countries around the world who are kicking ass like Sweden and Japan, I can't think that we're "the best."