Civilian casualty ratio
Some 7 million combatants on both sides are estimated to have died during World War I, along with an estimated 10 million non-combatants, including 6.6 million civilians. The civilian casualty ratio in this estimate would be about 59%. Boris Urlanis notes a lack of data on civilian losses in the Ottoman Empire, but estimates 8.6 million military killed and dead and 6 million civilians killed and dead in the other warring countries. The civilian casualty ratio in this estimate would be about 42%. Most of the civilian fatalities were due to famine, typhus, or Spanish flu rather than combat action. The relatively low ratio of civilian casualties in this war is due to the fact that the front lines on the main battlefront, the Western Front, were static for most of the war, so that civilians were able to avoid the combat zones.
List of Jewish Medal of Honor recipients
When World War I broke out, the United States initially maintained a policy of isolationism, avoiding conflict while trying to negotiate peace between the warring nations. However, when a German U-boat sank the British liner "Lusitania" in 1915, with 128 Americans aboard, U.S. President Woodrow Wilson vowed, "America isn't too proud to fight" and demanded an end to attacks on passenger ships. Germany complied and Wilson unsuccessfully tried to mediate a settlement. He repeatedly warned that the U.S. would not tolerate unrestricted submarine warfare, in violation of international law. In 1917, three years after the first shots of the war were fired, the United States entered the war and by the end of the conflict more than 4.7 million American soldiers, sailors and Marines would fight in the war.