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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 U.S. dollar was originally defined under a bimetallic standard of 371.25 grains fine silver or, from 1834, 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. In 1971 all links to gold were repealed.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. The dollar is the most widely used currency in international transactions, and a free-floating currency. WikipediaAbout Russian Ruble
The ruble or rouble is the currency of the Russian Federation. The ruble is subdivided into 100 kopecks. It is used in Russia as well as in the parts of Ukraine under Russian military occupation and in Russian-occupied parts of Georgia.
The ruble was the currency of the Russian Empire and of the Soviet Union. In 1992, the currency imagery underwent a redesign as a result of the fall of the Soviet Union. The first Russian ruble replaced the Soviet ruble in September 1993 at par.
On 1 January 1998, preceding the Russian financial crisis, the ruble was redenominated with the new code "RUB" and was exchanged at the rate of 1 RUB = 1,000 RUR. Wikipedia