During WorldWar II, what did many African Americans do?

Which of the following inventions most directly allowed ancient farmers to produce a surplus ?

Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire

Which of these rose during the great depression?