As is my wont, I study various periods in history. On my drive back from Missouri this week I was listening to Dan Carlin's Hardcore History podcast. He mentioned a fact that blew me away. I have not done the verification research, but Carlin is usually pretty good. Ponder this; in the first 3-1/2 years of WWI, the French had more casualties than the combined American losses in all of our wars.
According to Wikipedia, France lost about 1.35 million out of a population of 39.6 million. If you add civilian casualties that total increases to more than 4% of the population. If those numbers were applied to America's population today that would be losses of more than 10 million in four years.
Man is capable of creating true horror.