In God We Trust
From Treasury Department records it appears that the first suggestion that God be recognized on U.S. coinage can be traced to a letter addressed to the Secretary of Treasury from a minister in 1861. An Act of Congress, approved on April 11, 1864, authorized the coinage of two-cent coins upon which the motto first appeared.
The motto was omitted from the new gold coins issued in 1907, causing a storm of public criticism. As a result, legislation passed in May 1908 made "In God We Trust" mandatory on all coins on which it had previously appeared.
Legislation approved July 11, 1955, made the appearance of "In God We Trust" mandatory on all coins and paper currency of the United States. By Act of July 30, 1956, "In God We Trust" became the national motto of the United States.
Several years ago, the appearance of "In God We Trust" on our money was challenged in the federal courts. The challenge was rejected by the lower federal courts, and the Supreme Court of the United States declined to review the case.