Farmers
Farmers were producing too many crops and couldn’t sell them. So prices fell and farmers had to borrow money from the banks to be able to survive.
Black people
Black people suffered economically, especially in the southern states, where segregation was in effect. The ancestors of the black people in the south had been slaves.
Immigrants
Many immigrants had not been educated and were willing to work in any kind of job for very low wages. Because of this, they endured more and more prejudice.
Old traditional industries
The traditional industries failed to respond to the new mass-production methods of the 1920s, unlike the Ford company that was making a good profit and could pay impressive wages.