Voter turnout in the United States presidential elections
The broadest historical trends in voter turnout in the United States presidential elections have been determined by the gradual expansion of voting rights from the initial restriction to male property owners aged twenty-one or older in the early years of the country’s independence, to all citizens aged eighteen or older in the mid-twentieth century. Voter turnout in the presidential elections has historically been better than the turnout for midterm elections.[1]
https://www.sos.wa.gov/_assets/elections/history-of-voting-in-america-timeline.pdf