Because the Founding Fathers neglected the detail of when Election Day should be, the task fell to the states. This led, unsurprisingly, to “electoral chaos.” Congress got around to cleaning things up in 1845, when lawmakers figured out which day of the week would work best for voters.
“Monday was out because people would have to travel to the polls in their buggies on Sunday, the Sabbath. … And in a mostly farming society, Wednesday wouldn’t work because that was often market day,” NPR reports. So, Congress selected Tuesday.