2.USD (abbreviation of USD: USD; И o4217Currency code: USD; ; Symbol: USD) is the legal tender of the United States of America. Dollar banknotes in circulation are all versions of banknotes issued since 1929.

3, 1792 appeared after the passage of the American mint act. At present, the issuance of US dollars is controlled by the Federal Reserve system. Starting from 19 13, the United States established the federal reserve system and issued federal reserve bonds. More than 99% of the banknotes in circulation are federal reserve notes.

4.20 13 In the last two weeks of the first half of the year, the global stock market experienced a new round of plunge under the guidance of Federal Reserve Chairman Ben Bernanke's speech and China's "money shortage". Looking forward to the investment opportunities in the second half of the year, Pu Yonghao, chief investment officer of UBS Wealth Management Asia Pacific, believes that the US stock market with improved fundamentals is still the preferred asset class, and the US dollar may continue to strengthen.