The United States' Constitution grants certain powers to Congress, including the power to coin money, or the currency power. Those powers that are clearly stated are known as express powers. However, additional powers are implied or interpreted from the language of the express powers.

Creating a Federal Bank

The first use of implied currency power was in 1791, when Congress chartered a federal bank, the Bank of the United States, to pay war debts and create a standard form of paper currency, or bank note. These were exclusive private federal banks, which some argued were a power grab that favored business interests in the eastern part of the country. While many asserted that the bank was unconstitutional, it and the subsequent Second National Bank survived constitutionality tests by the U.S. Supreme Court in 1819 and 1824.

Introducing Greenbacks

The next notable use of implied power came in 1861 and 1862, when Congress authorized the issuance of “demand notes” and “United States Notes” to help fund the Civil War. Called “greenbacks” because of their green colored backs, these notes lacked a date when the government would buy them back and they were interest-free, meaning that a one dollar note was always worth one dollar. This was an important use of implied power, because the express power authorized borrowing money on credit, while these notes functioned more like a federal currency.

Uniform Bank Notes

In the Civil War, people relied on state bank notes, that were unreliable due to bank insolvency, fluctuation of value or were counterfeit. Congress and President Lincoln further expanded the use of implied powers when they created a system of nationally-chartered banks with uniform bank notes to eliminate the unfairness and confusion of state bank-issued notes. These acts of 1863 and 1865 also taxed state chartered bank notes out of existence and effectively created a federal currency.

Ending Gold Backing

Congress and president Franklin D. Roosevelt used the implied powers in 1933 because of inflation problems from the Great Depression. That act authorized the removal of all gold coin, gold bullion and gold certificates, or gold-backed certificates of tender, or notes, requiring that they be turned in for exchange of other forms of legal coin or currency in use. In essence, this was the beginning of the end of national tender based on gold-backed currency that was formally ended in 1976 by Congress as part of reforms by the International Monetary Fund.