When were US nickels not made out of nickel?

From mid-1942 to 1945, (World War II) composition nickels were created. These coins are 56% copper, 35% silver and 9% manganese. These coins are usually a bit darker than regular nickels, said to be due to their manganese content (as was true of many British coins minted from 1920 through 1947) Fact: The only other U.S. coins to use manganese are the Sacagawea and presidential dollars.