This wikipedia entry takes 6 paragraphs to explain the nuances involved and they are far more complicated than you state (not that I think you intended that way):
Which basically gets back to my original point in an international forum like this (or the one described by the above article) these colours don't really mean anything you can talk about and they're best avoided unless your goal actually is to sow confusion
https://en.wikipedia.org/wiki/Red_states_and_blue_states#Con...