How long is an elephant pregnant for? While a female elephant is in labor, the other elephants in the herd protect her by forming a circle around her. Most elephants only bear one baby at a time, but twins occur in approximately two percent of elephant births.
This set the stage for the complete elimination of silver from our coinage by the end of 1964. Any United States dime, quarter, half dollar or dollar that is dated 1964 or earlier is made of 90% silver. In the dime series, all coins dated 1965 or later are clad coins and contain no silver at all.
And you're correct, the Mint took silver out of circulating coins dated after 1964 to save on costs, similar situation with Lincolns (Now Zincolns) in 1982. Already, the costs of producing cents and nickels are over face value - so yes, it's only a matter of time until cent and nickel compositions/weight are changed.