The New Currency Act of 1871 introduced Japan's modern currency system, with the yen defined as 1.5 g of gold, or 24.26 g of silver, and divided decimally into 100 sen or 1,000 rin. It is also widely used as a third reserve currency after the US dollar and the euro. It is the third-most traded currency in the foreign exchange market, after the United States dollar and the euro.   The yen is the official currency of Japan. 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. Since 1971, all links to gold have been repealed. From 1934, its equivalence to gold was revised to $35 per troy ounce. The Gold Standard Act of 1900 linked the dollar solely to gold. 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 monetary policy of the United States is conducted by the Federal Reserve System, which acts as the nation's central bank.

banknotes are issued in the form of Federal Reserve Notes, popularly called greenbacks due to their predominantly green color. dollar at par with the Spanish silver dollar, divided it into 100 cents, and authorized the minting of coins denominated in dollars and cents. The Coinage Act of 1792 introduced the U.S.   The United States dollar is the official currency of the United States and several other countries.

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