Who is using their vote?
The 2020 US Presidential Election is estimated to have a 66.7% eligible voter turnout which would be its highest turnout rate since 1900 (73.7%). In contrast, countries where voting is mandatory see much higher eligible voter turnouts, such as the 2019 Australian election which saw >90% eligible voter turnout.
(https://bit.ly/3nryScd, https://pewrsr.ch/32MQZSj, https://wapo.st/32MR2xt)