I don't think so. I run a popular gaming server and people from China connect daily. It's a regular topic and most folks playing are young. It's not that they're unaware, it's just history for them. It's like saying Americans are unaware that the US military was the first and only nation to use nuclear weapons. We don't like it, but we're not unaware.
Most Americans are told in school that it was necessary. Several states are trying to remove slavery from history classes.
Depends on where you live and who your teachers are. Texas textbooks promote revisionist history where California textbooks put more effort into inclusion and critical thinking. Most states piggy on the CA or TX version, it depends on who makes the purchasing decisions at the state level but Americans based on location are typically subjected to one or the other.
Well, interpretation or background may be biased. But nobody tries to hide pure facts...