The role of race and racism in history and society is referred by the concept of color line. Du Bois, requires multidimensional analysis, which identifies and understands race and class at national and international level. He was primarily concerned with nature and intersection of race and class so he constructed three types of research illuminating the actual social conditions of African Americans for example “The Philadelphia Negro.” Secondly he wrote as said before interpretive essay’s that informed by careful historical research and personal experiences as well as keen observation for example, “The Souls of Black Folk” which emphasize the subjectice experience and sources of inequality. Thirdly he wrote an explicitly political essay focusing on Pan-Africanist and socialist solutions to inequality and racism for example color and democratic colonies and peace.
At the collective rational level, the color line results in realized social institutions such as the Jim Crow law regarding residential segregations of blacks in ghettos or poor neighborhoods. Also segregations of schools between black and white students,