U.S.soldiers returning from World War I brought back new influenza strains that killed an estimated 20 million people worldwide.

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This statement is true. The influenza pandemic of 1918, also known as the Spanish flu, is believed to have originated from soldiers returning home from World War I and spread rapidly across the globe, resulting in an estimated 20 million deaths.

USSoldiers Returning from World War I Brought Back New Influenza