Okay, I took that quiz, and I noticed a few errors.
First of all - there's no such thing as the RECONTRUCTION period in American history (question 20). The correct answer is Southern reconStruction!
Also, it was the 15th amendment that gave formerly enslaved Africans the right to vote, not the 14th as indicated in the quiz.
But then - it's BET. It's not like I expect much from them anyhow.
So if it weren't for those two errors, I would have scored 20/20.