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> "Celebrating Ohio's and America's 250th birthday"

> Ohio is 223 years old

You might have misread the text? I see something different in the “Celebrating Ohio and America’s 250th birthday”, which I read as celebrating:

1. Ohio overall 2. America’s 250th

Without the Oxford comma, it was the most reasonable way to read it.

You would never put an Oxford comma in a list of two items

Exactly. If someone says, “I’m running to the grocery and McDonald’s drive-thru,” no one assumes they are sharing a drive-thru…

Pedantic HNers might...

For real there is no single collection of online pedantry more pedantic than HN.

Actually, before HN there was Usenet which I assure you, as I know everything, was much more pedantic than HN ever was.

To my memory they are very similar amounts of pedantry. Not sure to how measure it tbh! Regardless, you're making a solid point. :)