Title: History of the United States dollar
Content:  standard was restored when the New York Stock Exchange re-opened in December 1914. For as long as the United States remained neutral in the war, it remained the only country to maintain its gold standard, doing so without restriction on import or export of gold from 1915 to 1917. When the United States became a belligerent in the war, President Wilson banned gold export, thereby suspending the gold standard for foreign exchange. After the war, European countries slowly returned to their gold standards, though in somewhat altered form. During the Great Depression, every major currency abandoned the gold standard. Among the 
Title: Gold Standard Act
Content:  The Gold Standard Act confirmed the United States' commitment to the gold standard by assigning gold a specific dollar value (just over $20.67 per Troy ounce). This took place after McKinley sent a team to Europe to try to make a silver agreement with France and Great Britain. On April 19, 1933, the United States domestically abandoned the gold standard, whereafter independent states would remain assured of their US dollar holdings by an implied guarantee on their convertibility on demand: the Bretton Woods system formalized this international arrangement at the conclusion of World War II, before the Nixon shock unilaterally cancelled direct international convertibility of the US dollar to gold in 1971.
Title: History of the United States dollar
Content:  The history of the United States dollar began with moves by the Founding Fathers of the United States of America to establish a national currency based on the Spanish silver dollar, which had been in use in the North American colonies of the United Kingdom for over 100 years prior to the United States Declaration of Independence. The new Congress's Coinage Act of 1792 established the United States dollar as the country's standard unit of money, creating the United States Mint tasked with producing and circulating coinage. Initially defined under a bimetallic standard in terms of a fixed quantity of silver or gold, it formally adopted the gold standard in 1900, and finally eliminated all links to gold in 1971. Since the founding of the Federal Reserve System in 1913 as the central bank of the United States, the dollar has been primarily issued in the form of Federal Reserve Notes. The United States dollar is the world's primary reserve currency held by governments worldwide for use in international trade.
Title: History of banking in the United States
Content:  To deal with deflation, the nation went off the gold standard. In March and April in a series of laws and executive orders, the government suspended the gold standard for United States currency. Anyone holding significant amounts of gold coinage was mandated to exchange it for the existing fixed price of US dollars, after which the US would no longer pay gold on demand for the dollar, and gold would no longer be considered valid legal tender for debts in private and public contracts. The dollar was allowed to float freely on foreign exchange markets with no guaranteed price in gold, only to be fixed again at a significantly lower level a year later with the passage of the Gold Reserve Act in 1934. Markets immediately responded well to the suspension, in the hope that the decline in prices would finally end.
Title: History of monetary policy in the United States
Content:  To deal with deflation caused by the Great Depression of the 1930s, the nation went off the gold standard. In March and April 1933, in a series of laws and executive orders, the government suspended the gold standard for United States currency. Anyone holding significant amounts of gold coinage was mandated to exchange it for the existing fixed price of US dollars, after which the US would no longer pay gold on demand for the dollar, and gold would no longer be considered valid legal tender for debts in private and public contracts. The dollar was allowed to float freely on foreign exchange markets with no guaranteed price in gold, only to be fixed again at a significantly lower level a year later with the passage of the Gold Reserve Act in January 1934. Markets immediately responded well to the suspension, in the hope that the decline in prices would finally end.
Title: History of the United States dollar
Content:  the Bank of England abandoned the gold standard in 1931 as speculators demanded gold in exchange for currency notes or in settlement of debts, threatening the solvency of the British monetary system. This pattern repeated throughout Europe and North America. In the United States, the Federal Reserve was forced to raise interest rates in order to protect the gold standard for the US dollar, worsening already severe domestic economic pressures. After bank runs became more pronounced in early 1933, people began to hoard gold coins as distrust for banks led to distrust for paper money, worsening deflation and depleting gold reserves.
Title: United States dollar
Content:   Though the dollar came under the gold standard de jure only after 1900, the bimetallic era was ended de facto when the Coinage Act of 1873 suspended the minting of the standard silver dollar of 412.5 grains, the only fully legal tender coin that individuals can convert bullion into in unlimited (or Free silver) quantities, and right at the onset of the silver rush from the Comstock Lode in the 1870s. This was the so-called "Crime of '73". The Gold Standard Act of 1900 repealed the U.S. dollar's historic link to silver and defined it solely as 23.22 gr of fine gold (or $20.67 per troy ounce of 480 grains). In 1933, gold coins were confiscated by Executive Order 6102 under Franklin D. Roosevelt, and in 1934 the standard was changed to $35 per troy ounce fine gold, or 13.71 gr per dollar. After 1968 a series of revisions to the gold peg was implemented, culminating in the Nixon Shock of August 15, 1971, which suddenly ended the convertibility of dollars to gold. The U.S. dollar has since floated freely on the foreign exchange markets.
Title: Silver standard
Content:  for silver, but this practice was halted on June 24, 1968. Finally, on August 15, 1971, President Richard Nixon announced that the United States would no longer redeem currency for gold or any other precious metal, forming the final step in abandoning the gold and silver standards. This announcement was part of the economic measures now known as the "Nixon Shock". Due to the monetary policy of the U.S. Federal Reserve, calls for a return to the gold standard have returned. Some states have chosen to use a loophole in the Federal Reserve Act that gives individual states the right 
Title: History of the United States dollar
Content:  Pool - but these actions were not sustainable; the danger of a run on U.S. gold reserves was too high. With Nixon's election in 1968, American officials became increasingly concerned until Nixon finally issued Executive Order 11615 in August 1971, ending the direct convertibility of dollars to gold. He said, "We must protect the position of the American dollar as pillar of monetary stability around the world ... I am determined that the American dollar must never again be hostage in the hands of the international speculators." This became known as the Nixon Shock and marked the dollar's transition from the gold standard to a fiat currency.
Title: Global financial system
Content:  the former gold standard. The early years of the Great Depression brought about bank runs in the United States, Austria, and Germany, which placed pressures on gold reserves in the United Kingdom to such a degree that the gold standard became unsustainable. Germany became the first nation to formally abandon the post-World War I gold standard when the Dresdner Bank implemented foreign exchange controls and announced bankruptcy on July 15, 1931. In September 1931, the United Kingdom allowed the pound sterling to float freely. By the end of 1931, a host of countries including Austria, Canada, Japan, and Sweden abandoned gold. Following widespread bank failures and a hemorrhaging of gold reserves, the United States broke free of the gold standard in April 1933. France would not follow suit until 1936 as investors fled from the franc due to political concerns over Prime Minister Léon Blum's government.

Question: when did the us dollar leave the gold standard?
Answer: October 1976.
August 15, 1971.
1934.