Schools are brainwashing those who do not question everything they are told. It is always best to do your own research, after the teacher tells you what they believe...teachers used to just teach the facts, but now they have to inject their personal beliefs onto very impressionable minds.
Good to see you not believing all the b.s. Christopher Columbus was not some monster. He was an explorer, back when being one was nearly tantamount to suicide. Yes, what he unintentionally brought to the Native Americans was bad for them, but it's not like he rounded them up into death camps.
Cheers!