I suggested an idea for 'Technological Power' and this factor can make troops more effective in combat. The United States could probably win against the entire world only because of how powerful their technology and how properly equipped/organized their troops are.
Here are some more small ideas that I've had previously.
- City Locations (Not names)
- Troop Gear Customization (gear, armor, -equipment)
- Riot Police (Rebellions)
- Supply Lines & Trade Routes (and the ability to attack/cutoff)
- Smaller Battles for realistic and immersive experience
- Military Bases (ability to create at a selected location)
- Education/IQ Factor (increase technological power)
- Request Economic Aid (Player and AI)
- Request to Claim Land (Better economical regions reduces chance)
- Automatic Troop Positioning button (Troops will automatically position themselves for defense purposes) in multiple cities
- Increased likelihood of an all-out invasion from an enemy country (ai)
- Naval Forces (battleships) (destroyers) (aircraft carriers) (submarines)