It’s unfortunately not that simple. The bulk of America’s farmland is in red states, so blue states on their own wouldn’t be able to feed their populations. Plus, red states tend not to have the biggest trade cities in the country, so they’d be choked in trade on their own. Also, all states break down into blue and red counties. Basically, if you’re a rural county, you tend to be red, and if you’re an urban or sub-urban county, you tend to be blue. So, even red states have plenty of democrats in them and vice versa.