Fort Knox.
Fort Knox <--- incorrect. The US keeps its silver supply in West Point NY
the government keeps us safe from bad people
large number of supply decreases the gold rate
It decreased as people sold silver and collected gold.
Silver certificates are no longer exchangeable for silver bullion due to classic supply and demand. Prior to the early 1960s the government controlled both the supply and price of all silver metal in the US. Because the price was fixed, it was possible to tie each silver certificate to a specific amount of metal; one dollar was equivalent to approximately 0.77 troy ounces of precious metal. However worldwide demand for silver skyrocketed due to increasing use in electronics and other high-tech applications. Both companies and other countries were willing to pay more than the fixed price for silver, which led to widespread speculation: People would exchange silver certificates for metal at the government's price, sell the metal for more on the open market, take the profit and re-exchange the rest for silver certificates which they exchanged again ... and so on. Speculation was so rampant that silver coins almost vanished from circulation and the government's stores of silver bullion were being depleted at an alarming rate. To prevent the money supply from being undermined the government stopped exchanging silver certificates for metal. In addition they had to deregulate the price of silver in the US and let it "float" on the world market like any other commodity.
Most of the gold is kept at Fort Knox.
In the US, no.
Federal trade commission
You can as a federal reserve note but not in silver coin. The US government in the late 1960s halted redemption of silver coin for silver certificates.
Silver and gold certificates were printed as a way of limiting and stabilizing the money supply. Each bill issued had to be backed by an equivalent amount of precious metal in the Treasury. The government controlled the prices of silver and gold so that a dollar's worth of either metal was always the same physical amount. Not all bills were issued as certificates; many were simply "fiat" bills that were backed by what was said to be the "faith and credit of the US". That is, they were backed by the acceptance of a large part of the population that the government and in particular the Treasury were extremely stable. The one-for-one backing of certificates by precious metal was a double-edged economic sword because it limited the government's ability to expand the money supply. During good times it helped to prevent inflation and other artificial currency manipulations, but during bad times the government couldn't add to the money supply which made downturns worse. Entire libraries have been written about the matter so a further discussion is beyond the scope of this site. The Great Depression forced the government to eliminate gold certificates so the money supply could be expanded. Silver certificates made up a smaller volume of money by dollar amount and remained in circulation, however. As the 1950s ended worldwide demand for silver skyrocketed which put severe strain on the Treasury's stockpile. The world price rose above the US-controlled price, making it possible for people to "game" the system by trading silver certificates for silver metal, selling it on the open market for more than they paid, using that money to buy more certificates, and so on. By 1963 the government was forced to discontinue printing silver certificates, and soon after that redemption for silver metal was halted. They were issued based on the US Silver standard and were presented under the premise that the note coud be redeemed for silver metal on demand.
The Bland-Allison Act of 1878 authorized the US Treasury to purchase 2-4 million ounces of silver per month to be coined into silver dollars. This was an attempt to boost the silver industry and increase money supply in the US economy.
It would increase the supply of money.