America is pretty third world too, unless you're just going by plumbing and nutrition standards?
Bloodsport for religion? Are you kidding me? We still have murders over religion here, and imagine, in the name of Christianity. The latest angry white killers are proof, but they aren't the first. What would America be without the third world? That goes for Europe too. During the time of Dickens, people were eating grass and rats, and abandoning their children, and doing very uncivilized things. I'm not sure what you're talking about, when you use this word "civilized".
None of what I'm saying takes away from how much I love this country and am willing to contribute to it. I'm not angry about my place in history, and actually, I'm proud, even if my ancestors chopped off thousand heads or didn't. But I won't deny it or frame it to make it seem like it was necessary for some reason or another. It happened and acknowledgement is the best thing to do, at least to avoid letting it happen again.
But since people are stubborn about identifying themselves and "their history" with the terms you yourself use to describe America, I doubt this would happen. We'll never overcome anything if we obsess over it. Part of that obsession stems from a lack of willingness to even agree to acknowledge what has taken place. It's happening all over. The wealth of a lot of nations including the US and England help continue that violence - I happen to come from a place like this where western agents always used leaders, and the leaders who did stand up to them ended up dead.
England is my favorite example - most of their wealth and that precious Enlightenment came from their exploitation and threatening of people/leaders in their Empire. They have entire museums full of stolen loot. The loss of that empire has turned into a lot of the empire coming back home and facing Mr. Darcy face to face. It's been rough, I'm sure, for both sides.
The same thing is happening now in America in terms of race. Lincoln said it would take several upon several generations to heal relations between black and white people in the US.