Absolutely true. Although there are quite a few people at Fort Drum just east of Watertown in the US Army that probably tend to vote Republican.
I just remember the US map that somebody put out for the Bush/Gore election that showed how much more land mass area had voted for GW over Al. Even left leaning states are almost all red outside of the cities.
However, NY has liberal small towns out in the rural areas like Plattsburg and Ithaca because of the colleges/universities that dominate those communities.
Same thing here in NH. The bigger colleges: UNH Durham, Keene State and Dartmouth dominate their regional politics.
Even in your state of GA on your map. Look how much the population of Atlanta(light blue) dominates the rest of the state. You need more conservative northerners to move to Sea Island and Jekyll Island.
What that map shows is that Dimmocraps have stacked key urban counties with immigrants legal and now illegal to gain a political superiority. It is dependent on their opposition remaining civil. If the red people stop being civil the structural flaw in putting their supporters in dense packed counties becomes obvious.