Why are we talking about slavery when the primary issue today is residential and educational *re*-segregation. "Guilt" is not what impedes progress towards racial integration in the US but rather both latent and manufactured racism, in particular, coming from a well-financed far-Right Republican money machine (Koch & Putin). The 1% is counting on ignorant whites to further their agenda of inequality and likely their racist lapdogs will obey their wealthy masters. They have thus far. 
"Segregation often overlaps with many other place-based inequalities—poverty, unemployment, crime, and housing quality and overcrowding. These overlapping disadvantages are seemingly much more common in the U.S. than in European countries,
where government efforts to promote integration (e.g., social and mixed-income
housing) provide a clear contrast to the market-driven solutions preferred in the U.S."
http://inequality.stanford.edu/sites/default/files/Pathways-SOTU-2016-Residential-Segregration-3.pdf