“Biden just won the presidency with less than 25% of all the counties in America. What does that tell us?”
To be fair, Republicans have won a large number of the counties in the country in presidential elections for some time now. They are the majority in many counties of under 25K population or so, of which there are many.
But you are correct that we are growing further and further apart as a nation. A poll of this sort inching up in terms of the number of people who think the best option is a national divorce reflects that.
The next time this poll is done I bet the percentage of those supporting division rises sharply.