referring to the years 1920 to 1940 on the graph, which of the following was a catalyst for the upward trend in the presidential popular vote as a percent of the population in that period?
Voter turnout also increased as age, educational attainment and income increased. Voter turnout was highest among those ages 65 to 74 at 76.0%, while the percentage was lowest among those ages 18 to 24 at 51.4%.
