Final answer:
The official motto of the United States, adopted in 1956, is 'In God We Trust'.
Step-by-step explanation:
The official motto of the United States, adopted in 1956, is In God We Trust. This motto is inscribed on U.S. currency and is a representation of the religious and spiritual beliefs of many Americans. It reflects the values and principles on which the country was founded, including the idea that trust in a higher power is important for the well-being and success of the nation.