World War I


1914-1918_World War IWorld War I saw the advancement of new deadly weapons including tanks, poison gas, and flamethrowers. One of the deadliest conflicts in human history, it led to over 37 million casualties (9-16 million deaths).

World Population : 170,060,000

Key:   1,000,000 People    1,000,000 People (Annotated)    Milestone

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