The Census Bureau post Black High School Attainment Nearly on Par with National Average by Jennifer Cheeseman Day (6/10/2020) notes:
In 1940, when the U.S. Census Bureau started asking about educational attainment, only 7% of Blacks had a high school education, compared with 24% for the nation as a whole.
In recent years, Black educational attainment has been much closer to the national average and today, 88% of Blacks or African Americans have a high school diploma, just shy of the national average, according to census data released last month from the Current Population Survey.
Related to the graph copied here:
The national average dropout rate declined from 19% in 1968 to about 6% in 2018. The Black dropout rate fell more steeply from 33% to 5%, bringing it in line with the national average.
Average enrollment for young adults increased from 26% to 41%. At the same time, the proportion of Black young adults in college more than doubled, rising from 15% to 38%.
The article contains five other graphs and links to the Census Bureau data sources.