Because in 1845 it made a ton of sense. Source.
For a society in which most people lived on farms, November was a good month to vote. The harvest was in, and snow hadn’t yet closed the roads. Why Tuesday? Records of lawmaker debate show that officials thought Sunday wouldn’t work, because many people were in church. Monday wouldn’t work, because most polling places were in county seats, and folks from outlying areas could not always get there in time.
Tuesday was the earliest day everybody could make it into town. So Tuesday it was.
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