First of all, your claims about well being are nonsense. Use a real statistic like literacy or average number of lost teeth. The white-Black literacy disparity or dental health disparity is clearly lower than 1950.

Also, none of your claimed income statistics are sufficiently granular to start a discussion since the average Black American worker may be something like 10 years younger than the average white American worker and also a weighted average by county of residence shows that Blacks live in places with lower wages compared to whites.

Edit: you're not wrong that social problems have changed and some could be due to government interventions but you paint a broad brush that is not accurate and sounds like a talking point blurb