No. The 1940s to 1960s were not a good time for black people.
America became great when the Civil Rights Act was in place. Black people are Americans too and they needed the right to be part of American society.
It is the far-left-wing mentality that is holding black people back in America.
Until the 1960s, Blacks had overwhelmingly intact families with two-parent households and low illegitimacy rates. They also had good schools and valued an education. They had also not been politically radicalized to the left.
Fast forward after the CR acts were passed by the 1970s and Great Society and the welfare state, they became an utter and complete basketcase and have NEVER recovered from said destructive policies that utterly ruined the Black family unit.