Later in life, I found out why. It's not that I didn't like history, I just don't like the sanitized version taught to me in primary/secondary school. It's like corporate public relations where they vaguely acknowledge wrongdoing, but communicate in a very weaselly way to downplay it.
The rote response I hear from the USA fandom is always some variation of "WELL THEM INDIANS DID BAD THINGS TOO" and it's like... ok? Then why obfuscate? If everyone is equally bad or whatever weird thing you're trying to say, why not just lay out all the cards and let me decide for myself how to interpret the history?