US dollar exchange rate (USD)

The US dollar (also a slang term buck) is the official currency of the United States of America and some other countries (Panama, Ecuador, El Salvador and East Timor decided to use it independently, some states of the former US territories in the Pacific have not adopted their own currency after independence), other states have their currency firmly tied to the US dollar. The US dollar is the most frequently used currency in international transactions and is used as a bank reserve in many countries. Nearly 700 billion US dollars were in circulation in April 2004, of which about two-thirds outside the United States. The reason is that many central banks hold it as a reserve together with gold (especially in the Middle East).