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.
The election of 1968 was the last U.S. presidential election in which the minimum voting age was 21. On July 1, 1971, the 26th Amendment to the U.S. Constitution was ratified, â¦ lowering the minimum voting age to 18.