country slavery, racially motivated lynching. we've also made tremendous process. this country eliminated slavery, reduced lynching, passed anti immigration laws and housing and public accommodations and implemented affirmative action in employment and most elected and reelected our first black president so we made a lot of progress but progress doesn't mean post racial, doesn't mean race is no longer a significant factor and president trump's comments simply reaffirm that notion, let's us know we're not there yet. >> a lot of people think black people should be over this racist pass because there's so much progress as you said. you're an expert in this. can you explain to people how that racist past shaped the present reality. >> absolutely, don.