Many dozens of countries use nickel in their coins. Please post a new and more specific question with the name(s) of the country or countries you're interested in.
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Copper-nickel coins for the dime and quarter started with coins dated 1965. The half-dollar remained 40% silver from 1965-1970 when it was changed in 1971 to copper-nickel removing all the silver of it.
That is what is known as a war nickel, because nickel was needed for WWII, it was needed to change the composition of the nickel to one including 35% silver, as of the time of writing, your coin is worth $1.64 in silver content alone.
There were 2 versions of the nickel produced during that year. On the reverse of your coin, above the Monticello there could be a large mintmark of a P, D, or S over it. This means you have a war nickel, during WWII the nickel had its nickel content replaced with 35% silver so these coins, regardless of condition are worth their silver content which at the time of writing is worth around $1.55. However, if your coin does not have a large mintmark on the reverse, it is just a common nickel and in circulated condition is really only worth face value to around 15 cents.
Your question could have a number of answers depending on what you mean. The first circulating U.S. coins to contain nickel were Flying Eagle cents minted 1856-1858. Cents contained about 12% nickel up till the middle of 1864 when the composition was changed to bronze. The next coins were copper-nickel 3¢ pieces (1865) and 5¢ pieces (1866). The next change happened a century later when silver rose in price. Dimes and quarters were changed from silver to copper-nickel in 1965, and half-dollars and dollars were changed in 1971.
U.S. coins used to be made with silver, typically a blend of 90% silver with 10% copper. Then modern dimes, quarters, and half dollars are nickel-coated copper. Nickels are made with 25% nickel and 75% copper. There aren't any coins made of a silver/nickel blend.