Final answer:
The 26th Amendment made 18 the minimum voting age throughout the US, allowing young adults to participate in the democratic process.
Step-by-step explanation:
The 26th Amendment to the US Constitution, ratified in 1971, made 18 the minimum voting age throughout the US, affecting voting in state and national elections.
Before the amendment, the voting age varied from state to state, with many states setting it at 21. The amendment was introduced in response to the activism during the Vietnam War, as young people argued that if they were old enough to fight in the war, they should be allowed to vote for the decision-makers. The amendment sought to ensure that young adults had the right to participate in the democratic process.