As I was finishing up my reading on the American Revolution this evening, I learned the following regarding the percentage of the American population killed in several of our wars.
1st place: Civil War – 1.6 % of population killed
2nd place: American Revolution – 1.0 % of population killed
By contrast, 0.06 % of Americans met their demise in the Mexican War, 0.12 % in World War I, and 0.28 % in World War II.
Source: Allan R. Millett and Peter Maslowski, For the Common Defense: A Military History of the United States of America, (New York: The Free Press, 1994), 82.