World War I casualties
Casualty statistics for World War I vary to a great extent; estimates of total deaths range from 9 million to over 15 million. Military casualties reported in official sources list deaths due to all causes, including an estimated 7 to 8 million combat related deaths (killed or died of wounds) and another two to three million military deaths caused by accidents, disease and deaths while prisoners of war. Official government reports listing casualty statistics were published by the United States and Great Britain. These secondary sources published during the 1920s, are the source of the statistics in reference works listing casualties in World War I. This article summarizes the casualty statistics published in the official government reports of the United States and Great Britain as well as France, Italy, Belgium, Germany, Austria and Russia. More recently the research of the Commonwealth War Graves Commission (CWGC) has revised the military casualty statistics of the UK and its allies; they include in their listing of military war dead personnel outside of combat theaters and civilians recruited from Africa, the Middle East and China who provided logistical and service support in combat theaters. The casualties of these support personnel recruited outside of Europe were previously not included with British war dead, however the casualties of the Labour Corps recruited from the British Isles were included in the rolls of British war dead published in 1921. The methodology used by each nation to record and classify casualties was not uniform, a general caveat regarding casualty figures is that they cannot be considered comparable in all cases.
Effect of World War I on children in the United States
Over the course of the war, the United States mobilized hundreds of thousands of men and endured an estimated 117,465 casualties. Of the men who survived and returned home, post-traumatic stress disorder created a major impact on society. During this time, and still today, post-traumatic stress (then more likely to be known as "shell shock") was not fully understood, but because of the traumatic nature of battle, many men were negatively affected after the war. Some men were forced to leave battle, which many people considered cowardice, and there were asylums throughout Europe housing men suffering from this condition. In some extreme cases, men were even shot for showing weakness. There are still people living today who lost family members because of this practice, which created lasting impacts on these children. Additionally, many of these men were teenagers when they left for war, and virtually all were under the age of 30; therefore many of these soldiers were barely out of childhood themselves.