Which amendment grants the right to vote to citizens 18 years or older?

The 26th Amendment to the United States Constitution specifically addresses the voting age, lowering it to 18 years. Ratified in 1971, this amendment was largely influenced by the shifting social attitudes during the Vietnam War era, when young Americans argued that if they were old enough to be drafted into the military, they should also have the right to vote. The amendment clearly states that citizens who are 18 years of age or older cannot be denied the right to vote based on age, thus expanding democratic participation and ensuring that a significant segment of the population, namely young adults, has a voice in the electoral process.

The other amendments listed have different focuses: the 15th Amendment deals with voting rights regardless of race, the 19th Amendment grants women the right to vote, and the 24th Amendment eliminates poll taxes in federal elections. Each of these is significant in its own context but does not address the specific voting age as the 26th Amendment does.