Real world observations prove that black people were much better off when black people weren't running Detroit and the party that claims to care so much about black people weren't running Detroit. The differences are so stark. Can you show me any other city where you can claim the inverse is true? Where a city went from a dump to a pristine jewel of a city when power was turned over to black people and the party that claims to represent them.
You mistake republicans as the party of white people because their policies are intended to create more opportunities for all who are willing to seize them. Democrats are the party of we'll give you free stuff. There is not enough free stuff to go around for that to bring anyone prosperity. For most people the only way to become prosperous is to seize opportunities that are available. Therefore more opportunities for people will increase overall prosperity whereas handouts will just take from those who have seized it and give to those who haven't and still won't make those who receive the handouts prosperous.