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 United States ratified the 26th Amendment in 1971 after weighing the pros and cons of lowering the voting age from 21 to 18. Today, there is a growing movement to allow teenagers aged 16 and 17 to vote in elections.