Why was the United States motto changed from “"E Pluribus Unum" to "In God We Trust" in 1956?

On July 30, 1956, the 84th Congress passed a joint resolution "declaring 'IN GOD WE TRUST' the national motto of the United States." The resolution passed both the House and the Senate unanimously and without debate. It replaced E pluribus unum, which had existed before as a de facto official motto.

Explanation:

Union supporters wanted to emphasize their attachment to God and to boost morale.

Explanation:

While the earliest mentions of the phrase can be found in the mid-18th century, the origins of this phrase as a political motto lie in the American Civil War.

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