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The Babel Proclamation was issued by Iowa's Governor William L. Harding on May 23, 1918. It forbade the speaking of any language besides English in public. The proclamation was controversial, supported by many established English-speaking Iowans and notably opposed by citizens who spoke languages other than English. Harding repealed it on December 4, 1918. The Babel Proclamation marked the peak of a wave of anti-German sentiment in Iowa during World War I.