Now here is a trivia question for you... When was the last time black unemployment was lower than white unemployment in the US? Progressives are good at feeding you the propaganda that blacks have always had historically higher unemployment than whites, but that's not true. Shlaes points out, according to the 1930 census data, black unemployment was lower than white unemployment.
That's not true, either. The fact you think a hack like Amity Shlaes is credible is part of your problem.
Now, here's the thing. In 1930, (besides the fact they weren't very good at keeping economic data) yes, most blacks worked in agriculture and most whites worked in Manufacturing... so of course Whites were going to get hit harder when the economy collapsed.