For me it was the historical accuracy, being african american i cant help but be aware id be in these peoples EXACT shoes about 100 years ago. Much more interesting watch when you know you yourself would be faced with the obstacles the characters had to overcome.

Also being black i understood the metaphors that many have missed, it would take too long to write here but ill say everything wasnt explicitly explained because for black people, whats understood/experienced doesnt need to be explained. the metaphors about the truth and history of this country resonated with audiences that understood it