Which information source do political campaigns have complete control over?

its a map of something

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.

the main objectives of the progressive movement were eliminating problems caused by industrialization, urbanization, immigration, and political corruption.