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Step 1I'll solve this problem by providing a clear, step-by-step explanation about when the US stopped making copper pennies.
Step 2: Understanding Penny Composition
The United States did not completely stop making copper pennies, but significantly changed their composition in 1982. Before 1982, pennies were made of 95% copper and 5% zinc.
Final Answer
This change was primarily motivated by the increasing cost of copper relative to the penny's face value.
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