This sort of 'historical revisionism' in the service of partisan politics accomplishes little except to make the revisionist feel good about him/herself.  The injustices rooted in this nation's inherently white supremacist social, political, economic, legal and educational institutions predates the EXISTENCE of either the Republicans or the Democrats, and both parties are equally guilty of implementing them.

Having said that, there are the exceptions that prove the rule--one of the only two truly GREAT white Americans was a Republican--Thaddeus Stevens.  The other, the great Christian martyr John Brown, rightly dismissed politics as 'talk-talk-talk.'