As one who taught U.S. history for 20 years, there was so much to love about Steven Spielberg's "Lincoln" the creation of mid-19th-century America, Daniel Day Lewis' portrayal of Abraham Lincoln.
The most fascinating and disturbing thing for me was the debate that raged in the 1865 House of Representatives over whether to abolish slavery with the 13th Amendment. In particular, the visceral hatred of blacks displayed by congressmen opposed to the amendment, and the absolute certainty that God and natural law didn't see slaves as worthy of the same rights as white men.
What would be next? Blacks voting? Women voting? Interracial marriage? Any of this was too abhorrent for the opponents to even think about.