What evidence of bias exists in the passage

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

How did the us change it’s economy to provide supplies for the war effort?

Which controversial political issue of the 1920 is reflected in the cartoon