Which amendment lowered the voting age to 18?

The 26th Amendment lowered the voting age to 18 years. Ratified in 1971, this amendment was a response to the widespread activism during the Vietnam War, where many argued that if 18-year-olds were old enough to be drafted into military service, they should also have the right to vote. This change aimed to empower younger citizens and ensure that their voices could be heard in the democratic process.

The 15th Amendment, which was ratified in 1870, aimed to eliminate racial discrimination in voting by prohibiting states from denying a citizen the right to vote based on race. The 19th Amendment, ratified in 1920, granted women the right to vote, marking a significant milestone in the women's suffrage movement. The 21st Amendment, ratified in 1933, repealed Prohibition, allowing the legal sale and consumption of alcohol. Thus, while these amendments address important aspects of voting rights and social issues, none of them pertain to changing the voting age, making the 26th Amendment the correct choice.