I was perusing death totals of American wars, and it was very evident that most other wars Americans have fought did not come close to the totals accrued in the Civil War. The Revolutionary War only had 25,000 casualties, and most of the other wars were far less than that. The War of 1812 ended with 15,000 American deaths, putting it at the closest. Even modern wars like Vietnam ended in only 58,000 deaths. Why was the Civil War so much deadlier at 625,000?