Joseph….
I did not use Google. I am a history buff. My BA degree is in US History. As for the exact dates of the election, I merely referred to my teaching notes. This is a piece of trivia I use in one of the courses I teach in US Government at a local college.
Federal Election Day was fixed as the first Tuesday after the first Monday in November in 1845. 1848 was the first Presidential election held on that date.
BTW>>>not all local/state elections are held in November. Here in CT there are still some municipalities with elections in March, but that is soon to e a thing of the past and we’ll have a unified date.