Answer:
Diseases.
Explanation:
Over the course of the American Civil War, diseases claimed the largest number of both Union and Confederate soldier lives, estimated to be around ~440,000, or 2/3rds of the total casualties inflicted during the American Civil War.
It continues to be the deadliest war that the United States partook in in all of her history.
Learn more about the American Civil War, here:
https://brainly.com/question/26825389
