The U.S. dollar was adopted in 1785 by the U.S. Congress as the official currency. U.S. dollar has grown increasingly important over the years and is now acceptable as the official currency of a large crowd of countries worldwide. At the same time comprised 64% of all central banks’ reserve currency the dollar in 2008, slightly down from the peak around 1999, when 71% of all currency reserves were in U.S. dollars.

U.S. dollar is the currency that is most used for international transactions.