Tiering system (War of the Nations)

The following are the subcategories that can be improved for the map game, War of the Nations. It is currently incomplete. From now on, I'm doing them decade at a time, so currently few things beyond 1870 are visible.

Colt M1861 Navy
Required year: Start/1861

Requirements: None

Effects: Minor boost to strength in conventional warfare.

Springfield Model 1861
Required year: Start/1861

Reuirements: None

Effects: Large boost to strength in conventional warfare.

Gatling gun
Required year: 1862

Requirements: None

Effects: Huge boost to strength in conventional warfare

Primitive Ironclad Warships
Required year: 1862

Requirements: None

Effects: Boost in naval warfare

Mechanical Submarines
Required year: 1863

Requirements: None

Effects: Boost to tactics in submarine warfare

Primitive Biological Weapons
Required year: 1914

Requirements: None

Effects: Boosts strength in conventional warfare. Gives large boost to strength in trench warfare and guerrilla warfare.

Primitive Chemical Weapons
Required year: 1915

Requirements: None

Effects: Gives large boost to strength in trench and guerrilla warfare. Minor boost to strength in conventional warfare.

Primitive Nuclear Weapons
Required year: 1940

Requirements: None

Effects: Capable of destroying small cities. As a result, very large boost to guerrilla warfare and large boost in trench warfare. Use against other nation with this or other nuclear weapon capabilities will start nuclear war and end all conventional warfare. Minor worldwide response. To launch, must be posted in turn.