Superstitions allotted the black death

Superstitions allotted the black death to the Devil.
According to superstitious people, the Black Death was caused by the Devil himself. The Black Death, also known as the Black Plague, refers to a series of pandemic diseases which took the lives of almost 200 million people in Eurasia over the years from 1347 to 1351. The actual cause of the plague was the lack of hygiene, helped by the outbreak of Yersinia pestis, bacteria carried by rats, rather than Satan himself, as was commonly believed. 

The exchange of foods between the new and old worlds

An example of a political opponent would be albert einstein hitler hated him because he was jewish a pacifist