Answer:
This is driven by a number of factors, alone or in combination, such as drought, climatic shifts, tillage for agriculture, overgrazing and deforestation for fuel or construction materials
Explanation:
Perhaps the greatest contribution of Grant and Sherman (Grant being the leader of the Northern forces) was that they knew when not to fight--that is when to hold back--since the North's army greatly outnumbered that of the South.
They were elected by the colonies
