The Twenty-sixth Amendment (Amendment XXVI) to the United States Constitution establishes a nationally standardized minimum age of 18 for participation in state and federal elections. It was proposed by Congress on March 23, 1971, and three-fourths of the states ratified it by July 1, 1971.
Various public officials had supported lowering the voting age during the mid-20th century, but were unable to gain the legislative momentum necessary for passing a constitutional amendment.
The drive to lower the voting age from 21 to 18 grew across the country during the 1960s and was driven in part by the military draft held during the Vietnam War. The draft conscripted young men between the ages of 18 and 21 into the United States Armed Forces, primarily the U.S.