What was the virulent menace that Americans faced in the postwar period that caused more casualties than the war itself?

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The virulent menace that Americans faced in the postwar period that caused more casualties than the war itself was the Spanish flu. The flu pandemic of 1918-19 infected an estimated 500 million people worldwide and killed between 17-50 million people, more than the total number of military and civilian deaths during World War I.

What Was the Virulent Menace That Americans Faced in the Postwar