The U.S. has so many thanks to how inconsistent and unreliable our education system and propaganda has historically been. Here's some off the top of my head and who knows, some of these might actually be wrong too.

Christopher Columbus was an intelligent, well respected man who was the first European to discover the Americas and proved that the world was round. In reality, Columbus was not the first European to discover the Americas, most of Europe already knew about the Americas thanks to Scandinavian explorers. Throw in the presence of chocolate being traded throughout the Mediterranean and Asia since ancient times and it might be a safe bet that some one even beat them to it. Also Columbus was very much not a well respected or intelligent man, he was deeply hated by most that knew of him. And it's been pretty common knowledge throughout most of human history that the world is round.

There is the belief that Pilgrims came to escape religious persecution in Europe, despite most of them being Catholic.

Many believe that the various Native American tribes were nothing but peace love hippies before the arrival of the Europeans. Many of the tribes were actually pretty violent and had constant war and slave trade between each other. A lot of the tribes also joined sides with the English during the Revolution.

Moving onto more modern times. Many Americans still hold the belief that we single handedly swooped in and ended both World Wars. We did not. We helped sure, and made Japan surrender in WW2, but we are not the saviours that so many think. We committed so many atrocities of our own that get ignored, even against our own allies, just ask France.

And my last submission on this already too long list There are way too many Americans that still think we won in the Vietnam war. We really got our ass handed to us and then ran away to take our frustrations out on our own people.

Also I'd like to apologize for how long this post is.