Which amendment to the Constitution allows citizens 18 and older to vote?

The Twenty-sixth Amendment to the United States Constitution is significant because it specifically prohibits the government from denying citizens who are 18 years or older the right to vote based on their age. Ratified in 1971, this amendment was a response to the argument that if individuals were old enough to be drafted for military service during the Vietnam War, they should also have the right to participate in the democratic process through voting.

The Twenty-sixth Amendment illustrates the evolving nature of voting rights in the United States, ensuring broader access to the electoral process and the recognition of younger citizens' capacity to make informed decisions. This amendment is a cornerstone in the fight for more inclusive democratic participation and highlights societal shifts regarding age and civic responsibility.