How did w. e. b. du bois challenge stereotypes in his exhibit of american negroes?

He challenged stereotypes by showing that blacks are intelligent, cultured, and revolutionary people.

Explanation:

W.E.B. Du Bois was one of the greatest American sociologists and activists from the turn of the twentieth century until his death in the 1960s. Invisible by widespread racism in social science, Dubois challenged stereotypes in his exposition of black Americans by displaying photographs, books, and scientific discoveries made by blacks, with this he showed that blacks, contrary to what many thought, were educated, intelligent, innovative, creative and revolutionary people.

the correct answer option is: weapons.

explanation:

tensions rose as the two opposing superpowers competed for 'weapons'.

referring to the cold war (1945-1991), the two superpowers, usa and ussr, experienced a phase of struggle and conflict with each other. these two superpowers considered each other as a threat to their survival and thus opted for policies to strengthen their positions.

the two superpowers never went to war with each other directly but competed for weapons to preserve their positions.