Americans first began the custom of weekday voting in 1845, when Congress passed a federal law designating the first Tuesday following the first Monday in November as Election Day.
Before then, states were allowed to hold elections any time they pleased within a 34-day period before the first Wednesday in December, but this system had a few crucial flaws.
Knowing the early voting results could affect turnout and sway opinion in states that held late elections, and those same last-minute voters could potentially decide the outcome of the entire election. Faced with these issues, Congress created the current Election Day in the hope of streamlining the voting process.