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.
â¢ V.A.P. = Voting Age Population 1) from 1972 includes citizens 18 years of age; 2) V.A.P. includes those ineligible to vote such as felons. Because of this, V.A.P. figures are naturally lower than if the Voting Eligible Population (V.E.P.) is used as the denominator. â¢ REG = Registered to Vote.