On this day in history, July 30, 1956, 'In God We Trust' is declared national motto 
On this day in history, July 30, 1956, the 84th Congress passed a joint resolution declaring "IN GOD WE TRUST" to be the national motto of the United States, according to History.com.
Passing in both the House and the Senate unanimously and without debate, the resolution replaced "E pluribus unum," which had existed before as a de facto official motto, the same source noted.
Just two years earlier, on June 14, 1954, President Dwight Eisenhower signed a bill to insert the phrase "under God" into the Pledge of Allegiance, said History.com. .......................
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