World War I casualties
The total number of military and civilian casualties in World War I were about 40 million: estimates range from 15 to 19 million deaths and about 23 million wounded military personnel, ranking it among the deadliest conflicts in human history.
Outline of World War II
World War II, or the Second World War – global military conflict from 1939 to 1945, which was fought between the Allied powers of the United States, United Kingdom, and Soviet Union against the Axis powers of Germany, Italy, and Japan, with their respective allies. Over 60 million people, the majority of them civilians, were killed, making it the deadliest conflict in human history.Causes of World War II