W.E.B. Du Bois, in his statement that "the problem of the Twentieth Century is the problem of the color-line," is addressing the persistent and complex issues related to race, identity, and inequality that define societal relations, particularly between Black and white people. The "color-line" refers to the social and economic boundaries that separate individuals based on race, specifically the discrimination and segregation faced by people of color, especially African Americans in the United States.
Du Bois highlights how this division not only affects individuals but also shapes the broader social, political, and economic landscape. The "problem" he refers to encompasses systemic racism, discrimination, and the struggle for civil rights and equality. By stating that this is the defining issue of the 20th century, he underscores the urgency of addressing these inequalities and working towards a more just and equitable society.
In essence, Du Bois is hinting at the necessity for a deep reflection and action on racial injustices, as well as the need for a societal transformation to overcome the divisions that have historically marginalized people based on their race. The implications of the color-line extend beyond simply addressing prejudice; they call for an understanding of the structures and power dynamics that perpetuate inequality, and the need for collective efforts toward reconciliation and social change.