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.
In 1970, Senator Ted Kennedy proposed amending the Voting Rights Act of 1965 to lower the voting age nationally. On June 22, 1970, President Richard Nixon signed an extension of the Voting Rights Act of 1965 that required the voting age to be 18 in all federal, state, and local elections.