Church - performs taxation and religion research, and is the main stopping point for your auxiliary units.
Military-industrial complex (requires 6 levels of Military research; available from )
Units heal within your borders
Reduces the build time of ships, foundry units and aircraft
Has a +10 oil and +10 metal bonus (once 3rd Green researched).
Reduces the knowledge costs of science research and the research time for military research.
Grants access to upgrades that allow for the creation of dreadnoughts, howitzers and heavy machine guns in .
Has a facility for building recoilless gun infantry and tanks (different non-European sides build different tanks in  - Tanks are powerful mechanised units that destroy all other units, but have their own weaknesses - recoilless guns destroy them; they are vulnerable from aircraft attack; a direct hit from a cannon could potentially destroy them; and they are slower than tankettes, although they are much powerful in a shot-for-shot battle.)