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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 In 1971 all links to gold were repealed.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 Bulgarian Lev
The lev was the currency of Bulgaria from 1880 to 2025. The euro replaced the lev on 1 January 2026; during the cash changeover period, the lev and the euro circulated in parallel for cash payments, and from 1 February 2026 the euro became the sole legal tender in Bulgaria.
The name lev derives from an archaic Bulgarian word meaning "lion". The lev was subdivided into 100 stotinki; the term is derived from the Bulgarian word for "hundred" and is modelled on the French centime. On Bulgarian euro coinage, the denominations below one euro use the inscriptions СТОТИНКА / СТОТИНКИ as the Bulgarian equivalent of "cent".
Under a currency board introduced in 1997, the lev was initially pegged to the Deutsche Mark. In 1999, the lev was redenominated at 1000:1 with 1 new lev equal to 1 DEM. Subsequently the peg was shifted to the euro at a fixed rate of 1 EUR = 1.95583 BGN. The lev joined the European Exchange Rate Mechanism on 10 July 2020 at the same rate until ultimately exiting both the ERM II and the currency board upon joint the eurozone on 1 January 2026. Wikipedia