I think you're mistaken. I choose to believe that ancient Americans crossed the Atlantic, built those structures, decided that working with stone was a pain in the ass and then moved back home. Also because of the falling of Atlantis. Also because Bison is much tastier. The Romans moved into these structures later and then wrote shit on them. Especially with their cumbersome numerical system. That's why the Gauls killed all of them. They didn't have a better idea for numbers they just knew the Romans sucked at them.
I suppose I should consult the wealth of archaeological evidence that points to the Roman's existence and their accomplishments but that's written in books and stuff and they could be lying. Kinda like how some people think that Columbus wasn't a dick and didn't have his history altered to make him look like a paragon of virtue worthy of being taught in elementary school.