It sure seems like over the last 60+ years, things have progressed, albeit slowly, with Democrats in charge, and regressed when Republicans were in charge. You can draw a line from abolition to women's suffrage to civil rights to gay marriage that all lines up with Democrats. The long arc of history Dr. King spoke about seemed to bend in the right direction under Democrats. Yet here you are denying history. Odd.
(By odd I mean delusional.)