what would happen in the USA if J Biden actually won the presidential election?

Not much.  It would be business as usual.  But for once maybe that's not such a bad thing.

We would be thrown into a deep depression.

Biden would be removed from office. With

a very probable reason to not think we could

recover.

Pedophiles would rejoice that one of their own became president.

We're have a president that always challenges people to fights even if he is a frail 77 year old man that never saw a weight room in his life. Of course, if people understand his challenge depends a lot on how badly he turns the sentence into gibberish that no one can understand. lol

The vice president would spend every day preparing to take over from a clearly worn-out Joe. IOW, we would have elected two presidents.

Prosperity and competent governance would return.

Wait until January and see