In one work, this thinker analyzed Helen Boardman’s three dominant theses about a certain historical period found in textbooks and described a nation as “ashamed” in the section “The Propaganda of History.” That book by this thinker analyzes the “promised land” of the white laborer and begins (15[1])with the sections “The Black Worker” and “The White (15[1])Worker.” One work by this thinker was praised for (-5[1])its criticism of the Dunning School in a book (15[1])by (15[1])Eric (*) Foner; (10[1])that (-5[1])book (10[1])was (10[1])“Black Reconstruction.” (10[4])Another work by this thinker (10[1])includes many (10[1])spirituals in “The Sorrow Songs” (10[1])and begins with the essay (10[1])“Of our spiritual strivings.” That book by this thinker claims the problem of the twentieth century is the “color (10[1])line.” (10[2])This man worked on the Encyclopedia Africana after emigrating to Ghana. (10[1])For 10 points, name this American thinker and activist who wrote “The Souls of Black Folk.” ■END■ (10[2])