Strategic Resources are one of the types of natural resources. When available to a city from foreign or domestic trade, strategic resources enable the construction of some units and city improvements. When a city has a strategic resource, it appears in the city's Strategic Resource box. City Production Bonuses Like all resources, strategic resources also provide city production bonuses to worked squares within a city radius. Types Food Shields Commerce Aluminum +0 +2 +0 Coal +0 +2 +1 Horses +0 +0 +1 Iron +0 +1 +0 Oil +0 +1 +2 Rubber +0 +0 +2 Saltpeter +0 +0 +1 Uranium +0 +2 +3