Democrats enacted Jim Crow laws (0). I see no evidence that Republicans have enacted any laws that systematically discriminate against black people, in fact Trump has tried to reform the criminal justice system (1). He pardoned Jack Johnson posthumously, and has been handing out pardons like candy to wrongfully accused blacks.
0: https://en.wikipedia.org/wiki/Jim_Crow_laws
1: https://www.washingtonpost.com/national-security/3100-inmate...