No one knows this.
"Most" coins of the world were never made of silver. There were always more minor coins made of copper, nickel, bronze, aluminum, etc. The larger coins of most countries contained at least some silver until the 1960s when the price of silver made almost all of them more valuable for their metal content than their stated denomination. The US eliminated silver in all coins in 1965 except for the Kennedy half dollar and it was reduced from 90% to 40% silver until 1972 when it also became a cupro-nickel alloy. Mexico and Canada had reduced the silver content of their coins even earlier, but kept a small percentage of silver in some coins for a few more years.
Athens had coins made of bronze, silver and gold.
The only U.S. coins currently made that are silver are American Silver Eagles and other special collectors coins sold by the U.S. Mint. These coins are NOT released for circulation.
No British circulating coin has contained any silver since 1946. From 1919/1920 to 1946, all British silver coins contained 50% silver. Prior to 1919/1920, all British silver coins were made from sterling silver or, 92.5% silver.
There were proof sets made in 1974 and 1975 where all 8 of the coins were silver, and proof sets made during those years when none of them were silver. Assuming that your coins are in a set, check the 1 Cent coin - if it looks silver, then all the coins in the set are silver; if it looks bronze, then none of the coins in the set are silver.
Romans coins were made of bronze, silver and gold.
Yes, there were several US silver coins made dated 2000, none though were intended for circulation. There were silver eagles made ($1 coins sold as silver bullion and are 1 troy ounce of silver), along with silver proof sets (with 90% silver dime, quarters and half-dollar) and a few silver commemorative coins made. Not to mention many foreign silver coins.
Silver dollar coins (1794-1935) were never made of pure silver. It's too soft and the coins would wear out very quickly. They (and most other silver US coins) were made of an alloy of 90% silver and 10% copper. Circulating US dollar coins were made of copper-nickel from 1971 to 1999. The composition was changed to gold-toned brass in 2000. Modern "eagle" coins with an artificial $1 denomination are made of 99.9% pure silver, but these coins aren't intended for spending.
It was 1964 when the last coins in the US were made from 90% silver.
Silver has been used in coinage ever since coinage was made. The earliest coins were made out of an alloy of silver and gold. Silver, along with gold, have been used for coins ever since coinage was made in 700 BC or so.
No. The US has never made a coin with pure silver. The closest to pure silver would be American silver Eagles. These coins are silver bullion coins. They are made of 99.93% silver and .07% copper.
Not a meaningful question. Gold coins were made from gold and copper without any silver in them. Silver coins were made from silver and copper without any gold.