Answer : George Brinton McClellan was an American soldier, civil engineer, railroad executive, and politician.
Explanation:
About 625k Americans died in the Civil War, this was the war that killed more Americans than any other! Most Americans died from disease being that doctors couldn’t really do anything to help them and, around 50k would die in prison camps the deadliest being Camp Sumpter located in Georgia.
Three years is the answer
They are selected by county supervisors and the district election board.