Modern silver coinage still exists! It's not minted as change, but as collectors items. The dime and half-dollar coins in this set are 90% silver and 10% copper, just as coinage has been through most of US history.
All five quarters are also 90% silver, each depicting a different state.
It's good to see that silver coinage isn't completely gone, it's just tucked away in people's private collections, pawn shops, coin stores and other various places.
Will these ever be put back into circulation? Very unlikely, but we never know.