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The following list is based on the maximum deaths in a war. Here are the world's bloodiest wars in history: 1. World War II: Fought from 1939 to 1945, the Second World War is the deadliest conflict in history, with over 70 million fatalities. ---- Of the past 3,400 years, humans have been entirely at peace for 268 of them, or just 8 percent of recorded history. At least 108 million people were killed in wars in the twentieth century. Estimates for the total number killed in wars throughout all of human history range from 150 million to 1 billion.