Final answer:
The 26th Amendment to the Constitution changed the voting age in the United States from 21 to 18.
Step-by-step explanation:
The 26th Amendment to the Constitution changed the voting age in the United States. Before the amendment, the voting age was 21, but with the passing of the 26th Amendment in 1971, it was lowered to 18. This gave 18- to 20-year-old citizens the right to vote.
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