While racism in the sense of legal discrimination is illegal, there are factors such as education and wealth which disproportionately affect the poor and because of only actually obtaining equal right under the law in be past 60 years black people in American has not had the same opportunity as other immigrants who have voluntarily migrated to America. In fact, voluntary African immigrants are some of the most successful and well educated voluntary immigrants to the US.
https://www.migrationpolicy.org/article/african-immigrants-united-states-0
About two of every five African foreign-born adults had a bachelor's or higher degree.
In 2007, 42.5 percent of the 1.1 million African-born adults age 25 and older had a bachelor's degree or higher compared to 27.0 percent among the 31.6 million foreign-born adults. About one-quarter (25.2 percent) of African-born adults age 25 and older had some college education (less than a bachelor's degree) or an associate's degree compared to 17.1 percent of all foreign-born adults.
On the other end of the education continuum, about 11.3 percent of African immigrants had no high school diploma or the equivalent general education diploma (GED), compared to 31.9 percent among all foreign-born adults. About 21.1 percent of African-born adults had a high school diploma or GED compared to 24.0 percent among all foreign-born adults.
Further African immigrants, those whose ancestors have not suffered directly under slavery experience increased wealth and Nigerians, Kenyans, and Ethiopians surpass the average white American wealth while rivaling the “model minority” Asian Americans.
Essentially the long history of slavery and discrimination where families are intentionally destroyed, heritage and culture erased, and education denied takes more than 60 years of recovery to equalize. Because he legal system and virtually all institutions in the US function more favorably the wealthier you are, groups which have been intentionally denied wealth will be further disadvantaged by these institutions. Because the denial of the basic rights of America were denied based on the category of race which severely impaired wealth, and our institutions favor those with wealth, a race which lacks wealth will perceive institutional discrimination which coincides with their race due to the history of discrimination.
Basically you can’t strip everything from a group of people work them like animals, throw them out into the streets to fair for themselves while actively denying them any ability to advance and expect that they are going to be ok. Signing a piece of paper doesn’t undo centuries of misabuse.
As I’ve said before, we are less than 60 year out from achieving true equality under the law and every single gap is closing and rapidly. It seems you fail to understand the incredibly achievement that is.