fractional coins which stayed in circulation. Pre-Civil War The United States also embarked on establishing a national bank with the First Bank of the United States in 1791 and the Second Bank of the United States in 1816. In 1836, President Andrew Jackson failed to extend the Second Bank's charter, reflecting his sentiments against banking institutions as well as his preference for the use of gold coins for large payments rather than privately-issued banknotes. The return of gold could only be possible by reducing the dollar's gold equivalence, and in the Coinage Act of 1834 the gold-silver ratio was increased to 16.0 (ratio finalized in 1837 to 15.99 when the fine gold content of the $10 eagle was set at 232.2 grains or 15.0463 g). Gold discoveries in California in 1848 and later in Australia lowered the gold price relative to silver; this drove silver money from circulation because it was worth more in the market than as money. Passage of the Independent Treasury Act of 1848 placed the U.S. on a strict hard-money standard. Doing business with the American government required gold or silver coins. Government accounts were legally separated from the banking system. However, the mint ratio (the fixed exchange rate between gold and silver at the mint) continued to overvalue gold. In 1853, silver coins 50 cents and below were reduced in silver content and cannot be requested for minting by the general public (only the U.S. government can request for it). In 1857 the legal tender status of Spanish dollars and other foreign coinage was repealed. In 1857 the final crisis of the free banking era began as American banks suspended payment in silver, with ripples through the developing international financial system. Post-Civil War Due to the inflationary finance measures undertaken to help pay for the U.S. Civil War, the government found it difficult to pay its obligations in gold or silver and suspended payments of obligations not legally specified in specie (gold bonds); this led banks to suspend the conversion of bank liabilities (bank notes and deposits) into specie. In 1862 paper money was made legal tender. It was a fiat money (not convertible on demand at a fixed rate into specie). These notes came to be called "greenbacks". After the Civil War, Congress wanted to reestablish the metallic standard at pre-war rates. The market price of gold in greenbacks was above the pre-war fixed