[@Shorticus]I'm going to reserve the right to give a general guideline of an area but ultimately leave the details to the player. 
So say you're invading a place like Massachusetts, I'll say:

[quote]The Massachusetts Commonwealth devoutly follows Americanism and are styled much like the old America just that it only has a figure head president and a republic senate which leads the nation. While lacking in a large professional army, they have a large number of irregulars and militia which are well regulated and decently equipped but lack strong, tactical commanders and discipline of regular troops.[/quote] 

I'd let the player describe the exact units/economy/etc.
If multiple people have an interest in one area, I'll put them up as an official NPC in the chars tab.