The USA is just as bloody as its parent, the UK, and they’re both as bad as other nations with an Imperial past.
Or, you know, damn near every single empire or powerful ruler throughout all of human history. The Greek golden age was only possible thanks to slaves working the fields, Rome was similar in this regard.
Eastern nations weren't any better, read up on ancient Chinese culture and all the fucked up shit they did.
Same goes for India, hell they're still trying to end child marriage but still represent like 20-25% of all child marriages in the world.
People love to dog on America, and I'll be happy to point out all the historical examples, but the truth is this is more a symptom of the human condition and less about a nation. Look at the other countries on earth and you'll find plenty of evidence that evil isn't isolated to one nation, people, culture or time period.
It's universally a human thing.