Which leader expressed a political division in the african american community in the book the souls of black folk?

The leader that expressed a political division in the African American community in the book The Souls of Black Folk was W.E.B. Du Bois.

Explanation:

The Souls of Black Folk is a collection of essays published in 1903 by the African American writer and activist W.E.B. Du Bois. In it, Du Bois considers the position of black people in the United States, where institutional racism was dominant, developing the concept of "double consciousness", that is, the thesis that African Americans feel the conflict between belonging to the black race and the American nation, so there is a mixed feeling of being part of the American society and being outsiders of it at the same time, and the conflicts and divisions that this situation creates. The book is now considered one of the classic works of American literature.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.