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About United States Dollar
The United States dollar is the official currency of the United States and several other countries. The Coinage Act of 1792 introduced the U.S. dollar at par with the Spanish silver dollar, divided it into 100 cents, and authorized the minting of coins denominated in dollars and cents. U.S. banknotes are issued in the form of Federal Reserve Notes, popularly called greenbacks due to their predominantly green color.
The monetary policy of the United States is conducted by the Federal Reserve System, which acts as the nation's central bank.
The U.S. dollar was originally defined under a bimetallic standard of 371.25 grains fine silver or, from 1837, 23.22 grains fine gold, or $20.67 per troy ounce. The Gold Standard Act of 1900 linked the dollar solely to gold. From 1934, its equivalence to gold was revised to $35 per troy ounce. Since 1971, all links to gold have been repealed.
The U.S. dollar became an important international reserve currency after the First World War, and displaced the pound sterling as the world's primary reserve currency by the Bretton Woods Agreement towards the end of the Second World War. WikipediaAbout Vietnamese dong
The dong has been the currency of Vietnam since 3 May 1978. It is issued by the State Bank of Vietnam. The dong was also the currency of the predecessor states of North Vietnam and South Vietnam, having replaced the previously used French Indochinese piastre.
Formerly, it was subdivided into 10 hao, which were further subdivided into 10 xu, neither of which are now used due to inflation. The Vietnamese dong has increasingly moved towards exclusively using banknotes, with lower denominations printed on paper and denominations over 10,000 dong, worth about 40¢ dollar or euro, printed on polymer. As of 2022, no coins are used. Generally, Vietnam is moving towards digital payments. The 500,000-dong note is the highest-denomination banknote in circulation in Vietnam. The note is dark blue in color and has been in circulation since 2003.
As of October 2023, the Vietnamese dong was the second-lowest valued currency unit, with one United States dollar equaling 24,385 dong. Wikipedia