If the US were to be divided into three countries like the following, it would be a lot easier for progressives and liberals to emerge and dominate the green and blue countries, and a lot easier for conservatives to take back their liberty in that red country.
My only problems would be that 1- African Americans and Hispanics taking up huge chunks of the red country, and having to live under conservative regime which would most definitely hurt them. 2- It would most certainly weaken the US' global presence.
Still, that blue northern country would be a dream come true in terms of politics