So it makes sense under several historically contextual reasons.

First, you must understand that customary date formats were determined by what the newspapers historically mostly used. In America that became Month/Day, in Europe it was Day/Month.

Now, culturally, the reason the papers chose that format follow under three broad reasons.

One, unlike Europe, the market for papers had a higher, more distant rural demand. The farming communities would often get a monthly or weekly paper, they weren’t necessarily publishing for urban people that could get a daily update. The month of the paper was simply more important unless something notable happened, and then you would get a special edition.

Two, the American papers chose a conversational tone for the date. In English you say “October the tenth” unless you want to class it up a bit and go with “the tenth of October.” American audiences were more casual, so it followed that trend.

Three, and most importantly, we did it to be different, die mad about it.