The 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 white male property owners aged 21 or older in the early years of the country's independence to all citizens aged 18 or older in the mid-20th century. Voter turnout in United States presidential elections …

In electoral systems, voter registration (or enrollment) is the requirement that a person otherwise eligible to vote must register (or enroll) on an electoral roll, which is usually a prerequisite for being entitled or permitted to vote.. The rules governing registration vary between jurisdictions.In many jurisdictions, registration is an automatic process performed by extracting the names of ...