They aren't but thats not the point. Democrats committed genocide on Native Americans. Democrats started the civil war. Democrats were the pro slavery party. Democrats started the KKK to keep blacks from voting. Democrats put American CITIZENS in concentration camps. Democrats created Jim Crow to oppress non Whites. Democrats created the war on poverty and welfare to keep non Whites government dependent.. Hell your avatar name is racist. Do you know who the Louisiana Tigers were? None of this is wild conjecture. Everything I mention is 100% historical fact.
So at what point does your party's history start? Clinton era? No. Byrd, a Klansman, was still in Office. Obama era? Damn, Byrd still in office as a democrat. Trump era?
The longer the democrat party keeps its name the longer it continues to perpetuate White Supremacy and remind people of the horrors they committed against people of color for centuries.