African and Caribbean immigrants do very well in the US economically and in terms of education, despite being black - so problems of the black community can't be due to racism. It is cultural.
Per Walter Williams, black Ivy League economist, black crime rates were lower and employment rates higher in the 1950s - two generations closer to slavery. If we could blame slavery for everything, you'd expect improvement over time, not a deterioration starting in the 1960s - which is linked to black leaders saying sign up for welfare as reparations, causing the illegitimacy rate to soar.
Race relations have declined under the first black president because he blames everything on whites for past injustices (ignoring that the KKK and Jim Crow laws are entirely Democrats) and demonizing all whites with collective guilt while denying any collective credit (600,000 dead whites to end slavery in the US and white Christians ending it worldwide, when slavery was a worldwide institution).
Disagree with Obama's socialist policies? Racist, evil, not allowed any rational basis for disagreeing.
Disagree with open borders to bring in more people from mostly socialist nations? Racist, bigoted, irrational hater.
Disagree with affirmative action and set-aside contracts that favor blacks? Racist, evil, shut up.
Want federal contracts? You get preference if you implement social engineering policies that push diversity training on all people, that all men are sexist, all whites are racist, all heterosexuals are phobic.
Then you have Black Lives Matter. It is not a response to police brutality, because whites and Hispanics killed by cops don't matter to them. They don't care about the tens of thousands of blacks killed by other blacks each year, many of them innocent bystanders and children.
The only black lives that matter to them are taken by cops, and they readily say they want to kill whites - without any consequence, too. That destroys race relations.
Black Activists Call for Lynching and Hanging of White People, Cops
BLM activist advocates white genocide at Harvard
And that's on top of the insane double standard that Twitter even allows the hashtag #killallwhites to even exist much less violent rhetoric accompanying it, while criticizing a black actress gets a gay Brit a lifetime ban.