They stopped because Democrats began telling them they were victims, gave them free stuff, told them that everything that happens to them is someone else's fault, and then fed that story to them for 50 years. That is systemic. The question I always ask is why the cities that have been run blue for decades are hellscapes and the Left blames the Right. It is insane.
Bullshit!!! you only show your ignorance of black people, and trying to paint people into your biased insidiousness. Black People stand for the principles of Democracy, and never did black people ask white people for anything, it has been white people wanting from black people. They relied on black labor to clear the land and provide labor, so that white people who wanted wealthy but did not want to do the work to get it.
The Democratic Party is about "People Before Industry".... and people are the most important national security variable in any nations.
You should read and learn rather than spew bias generated folklore, white elite wealthy white men, never wanted to see black people have economic parity with white men, and when they saw black people earning, they constructed to curb and constrict it, it was the same with Unions, when Civil Rights was Passed in 1964, the wealthy white went into over drive to dismantle unions, because it did not want blacks nor women to have class and craft pay equal to that of white men.
Republican have been trying to dismantle the principles of Civil Rights since the days of Richard Nixon..... The Democrats once they ridded themselves of the dominance of Dixiecrats... became the Party that embraced Civil Rights. The Republican Party Took up the agenda of the Former Dixiecrats. Today, every white hate group is a member of the Republican Ranks, The groups that came along with various Regiments of mentality that embraced elements of Dixiecrat ideology.
Black people don't need dictations from White Republicans nor White Democrats, black people have known the principle values of freedom and equality, since their presence in this nation. they came from a Nation where they were free....
many white people came from Serfdom, Class and Cast Systems of Monarchy's, Peon Status, Back Woods of European Location, and Ghetto's of Europe, and during the entire 1800's many came to American with delusions of wealthy and they came many as being uneducated. they brought with them every kind of prejudice that one can imagine, not only against black people, but prejudiced against each other who come from various European location, and still today, there are white segregated areas based on the country of origin.... These various white people from various European Locations, come together
only when it comes to being prejudice against none white people.
You
can't name any legislation that Modern Day Republicans have addressed to promote equality and social and civic respect for and of black people.
The last thing black people need is any white person trying to tell them how to think, and what to support and how to vote.
Black people are well aware that Not all white people who say they are Liberal are truly Liberal, they may support many things of equality, UNTIL they have to face giving up elements of white privilege's.
It is overt that many Right Winger, will oppose anything that promotes equality that comes to them having to give up white privilege's and the concept of superiority.
White people have been groomed through 100 yrs of Segregation with much bias and ambiguity within bias, and some still think they can "Ration Out Rights To Black People"...
You'd do better to talk to white people about learning the principles of " Multi Cultural Civility" and "Respect For Human Equality of Person, As Individual" .... and how to abandon of savagery of Racism. 
