The ones we didn't hang, we relegated to second-class citizenship until they finally grew tired of it and rightfully demanded equal access to the American dream. Happily, most have taken advantage of the opportunity, and the result is a rapidly growing black middle class. Don't think we don't have problems. But I can't think of one country that doesn't. Most countries, though, are too arrogant to admit it.
Many people abroad resent our success.
Rather than solve their own problems, the malcontents in some countries find it easier to gather a bunch of thugs, invite the TV crews and burn our flag as we wring our hands, wondering what we did. In fact, we are the most caring and giving nation on earth, but it seems the more we care and the more we give, the more we are disliked. We just have to live with it, and frankly, I haven't lost a lot of sleep over it. But be prepared for more of the same in the future. No country is dumb enough to take us head-on, but a lot of them will try to nibble away at our insecurities and weaken our resolve.