In 1917 Woodrow Wilson (D) instituted slavery in the USA, violating the 13th amemendment. A disproportionate number of blacks were enslaved.Most Blacks dont vote repub.If blacks think slavery was so terrible then they should quit voting for the party of slavery.
In 1940 FDR (D) reinstituted slavery.
In 1950 Harry Truman (D) reinstituted slavery and Dwight Eisenhower (R) ended slavery in 1953.
LBJ (D) Reinstituted slavery during the Vietnam war. Of course blacks were again disproportionately enslaved. Richard Nixon (R) ended it.
And Democrats have tried to reinstitute slavery on several occasions since then, however, they were always blocked by Republicans.
Face it, the Democratic party is the party of slavery.