I thought this was important so I went to the
US Census Bureau table on mean income over time against race to get mean incomes for whites and blacks from 1948-2001 (in fixed 2001 dollars). Then I created a graph of it.
Conclusion: there is still a very large gap in income. However, percentage-wise, blacks ARE catching up. White income was about 100% higher than black income in 1948 and now is about 30% higher.
I also learned, in browsing around the tables at the census bureau, that in 2001 white women and black women's mean income was about the SAME. !!!