deadliest wars in history genocide Spanish flu post-war instability contributed World War II
World War I was one of the deadliest wars in history and resulted in an estimated 9 million soldiers death and 23 million wounded, while 5 million civilians died due to military action, hunger and disease. Millions more died as a result of genocide, and the devastation of the war heavily contributed to the 1918 Spanish flu pandemic. The inability to manage post-war instability contributed to the outbreak of World War II in September 1939.
