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On April 30. 1789, George Washington stood on the balcony of Federal Hall in New York City, the temporary national capital. He took the oath of office on a Masonic Bible, ad-libbing the words “So help me God,” which the oath of office as specified in the Constitution does not require.
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Kenneth C. Davis (America's Hidden History: Untold Tales of the First Pilgrims, Fighting Women, and Forgotten Founders Who Shaped a Nation)