Final answer:
In the U.S., citizens must be 18 years old to vote, set by the Twenty-Sixth Amendment due to Vietnam War activism.
Explanation:
In the United States, a person must be 18 years old to vote in elections. This age requirement was established by the Twenty-Sixth Amendment in 1971, lowering the minimum voting age from 21 to 18. The amendment was a result of the activism of young Americans during the Vietnam War era.
Learn more about voting age in the United States here:
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