Go here to view a slide show on the evolution of Paricutin prepared by Scott Rowland. Sources of Information: Foshag, W.F., and Gonzalez-Reyna, J., 1956, Birth and development of Paricutin volcano: U.S. Geological Survey Bulletin 965-D, p. 355-489.
In 1971, the Twenty-sixth Amendment set the legal voting age at 18 for both US federal and state elections.
1970: 18-year-old vote in law & then Amendment. [I disagreed with] the decision of the Democratic Congress and President Nixon to impose the 18-year-old vote on the states. In extending the 1965 Voting Rights Act, Congress in 1970 added a rider declaring that 18-year-olds had the right to vote in federal elections.