Answer :
They killed millions and led people to move cities.
Many people were moved off of their land or were experiencing terrible agricultural disasters, due to changing weather and climate and were unable to grow any produce or plants, forcing them to move to urban centers where they would be able to make money to feed themselves.
Many people were moved off of their land or were experiencing terrible agricultural disasters, due to changing weather and climate and were unable to grow any produce or plants, forcing them to move to urban centers where they would be able to make money to feed themselves.
Answer:
They killed millions and led people to move cities.
Explanation: