Final answer:
In the United States, citizens are allowed to vote at the age of 18 due to the 26th Amendment ratified in 1971.
Explanation:
In the United States, citizens are allowed to vote at the age of 18. This right is granted by the 26th Amendment to the Constitution, ratified in 1971. The amendment ensured that the voting age nationwide is 18, giving young adults the right to participate in state and federal elections.
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