тут скорее даже социология + хорошая погода круглый год. Я уже несколько раз встречал это утверждаение: At about 800 people per square mile, people switch from voting primarily Republican to voting primarily Democratic. Put another way, below 800 people per square mile, there is a 66% chance that you voted Republican. Above 800 people per square mile, there is a 66% chance that you voted Democrat. A 66% preference is a clear, dominant majority.
https://medium.com/@davetroy/is-population-density-the-key-to-understanding-voting-behavior-191acc302a2b