Add a construction rule:

Countries may construct buildings at any time. Each building takes a certain integer amount of periods to build as well as certain amounts of commodoties per period. A building may also require certain amounts of commodities to begin its construction. All these amounts may be different for countries of different races.
A country may announce the constructing of a building on the world page by adding “constructing: (name of building), (amount of periods left) periods left” to the world wiki page, under ‘buildings’, and substracting the initial cost (if there is one) of the building from eir commodities. E may construct no more than two buildings at the same time, and e may not construct two in the same territory at the same time.

Often, e may substract the listed amounts of the commodities needed for the building from eir commodities and may substract 1 from the amount of periods listed on the world page. When this amount of periods has reached zero, the building is considered completed and operating, and the added term to the world page is to be replaced by the name of the completed building.

The following building is available for construction:

Farm
Cost:
Average guys: 12 metal for 6 periods, no initial cost
Robots: 12 metal for 4 periods, an initial cost of 15 metal
Effects:
Upon completion, the production capacity of the territory for grain shall be increased by DICE4, which shall be rolled by the territory’s owner if it has one, or by the hegemonist if it hasn’t.
When a farm is demolished, the production capacity of the territory for grain shall be lowered by 1 plus DICE2, which will be rolled by the territory’s owner if it has one, or by the hegemonist if it hasn’t.

Add to the Races rule:

The race of each country shall be tracked in the GNDT

The races need to be tracked if the rule is to take effect.