In DuBois's study on Black communities, which aspect of social stratification was most prominently examined?

In DuBois's study on Black communities, the most prominently examined aspect of social stratification was the impact of race on social class and economic opportunities. He highlighted how systemic racism created barriers that limited the economic advancement of Black individuals compared to white individuals. For example, DuBois noted that many Black people were restricted to low-paying jobs and faced discrimination in education and housing. This unequal access to resources led to a cycle of poverty that was hard to escape. Overall, DuBois's work emphasized the need to understand how race and class intersect to shape the experiences of Black communities in America.