In the united states during world war i, public outrage against the germans swept the nation following
a. the bombing of pearl harbor.
b. the german invasion of poland.
c. the assassination of archduke franz ferdinand.
d. the sinking of the british ocean liner lusitania.

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.

b europeans take corn to africa. corn becomes an important crop there.