Since 1971, U.S. citizens have been able to utilize Federal Reserve Notes as the only form of money that for the first time had no currency with any gold or silver backing. This is where you get the saying that U.S. dollars are backed by the “full faith and credit” of the U.S. Government.
Similarly, you may ask, when did we get rid of the gold standard?
No country currently backs its currency with gold, but many have in the past, including the U.S.; for half a century beginning in 1879, Americans could trade in $20.67 for an ounce of gold. The country effectively abandoned the gold standard in 1933, and completely severed the link between the dollar and gold in 1971.
When was the gold standard adopted in the US?
The United States, though formally on a bimetallic (gold and silver) standard, switched to gold de facto in 1834 and de jure in 1900 when Congress passed the Gold Standard Act. In 1834, the United States fixed the price of gold at $20.67 per ounce, where it remained until 1933.