Every president in my lifetime got the party nomination by running in the party’s primary held on different days in different states. It’s called “primary season.”

Also, on the federal level Senators and Representatives are fund raising for their campaigns throughout their term.
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More than 150 million people voted in the last presidential election, a not insignificant portion of the US population. Election Day is held on the Tuesday after the first Monday in November, a normal work day.
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If the goal is to allow as many people who want to participate in the election to vote, thne early voting and mail-in voting are good solutions. Otherwise, clutching pearls that everything should happen on a single day looks like you don’t want full participation.
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