While it is not something you find everyday in your change in the states , silver is something to watch out for, kennedy half dollars are the most popular finds, though 1940s and 1950s silver is in there with a shout as well as silver is not pulled out by private banks for the fed it tends to circulate till someone finds it .
Many current coins are still legal tender even after 100 years or so (cents) so the stuff that you can find (In theory at least ) is much more interesting than the uk where there is no circulateing silver and nothing b4 1971