Nebraska says yes to 18-year-olds voting
Nebraska ratified the proposed 26th amendment to the Constitution on April 5, 1971. Congress had passed the proposal on March 23, 1971. The proposal stated that “the right of citizens of the United States, who are eighteen years of age or older, to vote shall not be denied or abridged by the United States or by any State on account of age.” After the required three-fourths of the states agreed, the proposal was certified as an amendment on July 1, 1971.
National Archives, General Records of the U.S. Government