there's this insidious myth that republicans are somehow better for black voters because there were and are racist dems when the pattern of legislation and leadership shows that on average, the democrats enact policies in favor of equality and advancing black rights much more so than republicans.
historically: desegregation of the military, desegregation in brown v board (8 of the 9 justices were dem nominated justices), civil rights act, etc. were all under dem leadership.
anecdotally: promoting black officers in the military, naming african americans to positions of leadership and power (cabinet, federal court, supreme court, attorney general), etc. all occur first, and more frequently under dem leadership.
culturally: yes, there were dixiecrats, and yes, there were and continue to be racists but as a whole, african americans trust the federal government moreso than their state governments, who like to pull bullspit like this, and on a whole, nationally, dems are working for the common, collective, racial whole:
and just in general, don't be a dumb f*ck about the nuances of effective leadership and their respective effectiveness. yeah there's a lot to criticize the democratic party for. but to be a reductionist assh*le about it by making statements saying dems haven't done anything for black people is ignorant, and bullspit.