One: 1792, the dollar adopts the double standard of gold and silver. According to the Coinage Law promulgated that year, one dollar is equivalent to 37 1.25 grains (24.057 grams) of pure silver or 24.75 grains (1.6038 grams) of pure gold. Until 1873. A dollar worth 24.057 grams of silver is about the equivalent of a Spanish silver dollar.

Two: Because the American government rarely minted a dollar coin, before the Civil War, the Spanish silver dollar was always one of the main currencies in circulation in the United States. Many American officials and private banks also use Spanish silver dollars as reserves, and most Americans convert paper money into Spanish silver dollars.

Three: After the first US Treasury Secretary took office, the US currency adopted the "gold standard". By 19 14, the first world war broke out, because countries stopped importing and exporting gold, and the gold standard disintegrated. In the later period of the gold standard, the gold content of the US dollar was 1.50466 grams.

Four: 65438+65438 In 0934+3 1 October, the gold content of one dollar is defined as 13.7 14 capsules (0.88867 1 g). The official price of gold rose from $20.67 to $35 an ounce. By the time 1934 dollars depreciated, the US government gradually recovered all kinds of coupons before 1922. The depreciated dollar cannot be cashed, and only foreign central banks can exchange gold for the United States at official prices.

5:1971August 15, US President Nixon announced the depreciation of US dollars and stopped the exchange of US dollars for gold, and the Bretton Woods system began to collapse. In order to overcome the chaos in the international financial market, major capitalist countries negotiated repeatedly and finally reached the Smithsonian Institution Agreement on June 197 12. Its main contents are as follows: the dollar depreciated by 7.89% against gold, and the official price of gold rose from $35 to $38 per ounce;

The conversion parity of intransitive verbs has increased from 1% to 2.5%, the gold content of US dollars has decreased to 0.8 185 13g, and the parity of special drawing rights has decreased from 1: 1 to 1, which is equal to 1. However, these measures failed to prevent the deterioration of the US balance of payments deficit and the US dollar crisis.

Seven:1973 February 12, the dollar depreciated again 10%, the gold content dropped to 0.73662g, and the official price of gold increased to 42.22 USD/oz. The depreciation of SDR to $65438 +0.20635 equals $65438+0 "SDR". European countries and other major capitalist countries withdrew from the fixed exchange rate system one after another, and the fixed exchange rate system completely collapsed, and the exchange rate of the US dollar fluctuated. At this point, the dollar no longer has legal gold content.