American silver coins

Are silver coins made by the US Mint.

Quarters, Dimes, Half dollars and dollars struck for circulation dated 1964 and prior are 90% silver.

Half dollars dated 1965-1970 are 40% silver.

All US Coins intended for circulation dated 1971 and later are not silver.

The US has and does mint silver coins intended for collectors including the American Silver Eagle, since 1992 they have made a silver proof set and there have been many silver commemorative coins minted.