A Century of War: Lincoln, Wilson and Roosevelt
The horrors of the twentieth century could hardly have been predicted in the nineteenth century, which saw the eighteenth century end with the American Revolution bringing about the creation of the first classical liberal government in history. The twentieth century was the bloodiest in all history. More than 170 million people were killed by government with 10 million having been killed in World War I and 50 million killed in World War II. Of the 50 million killed in World War II, nearly 70 percent were innocent civilians.
Mises Institute, 2007