Without a high school diploma, white Americans have a mere 1.7% chance of becoming a millionaire. A 20+ fold difference.
"What Are Your Odds of Becoming a Millionaire?"
https://www.bloomberg.com/features/2016-millionaire-odds/
"Bloomberg News asked economists at the Federal Reserve Bank of St. Louis a question: Would it be possible to calculate the odds of being a millionaire for anyone in the U.S., based on age, education and race?"
"According to the sample, a black person’s odds of being a millionaire increase from less than 1 percent if he or she doesn't complete high school to 6.7 percent with a graduate degree. White Americans without a high school diploma start out with slightly better chances—1.7 percent—that rapidly improve with more school: A graduate-level education increases their probability of amassing a net worth greater than $1 million to 37 percent."