Industrial Effort - Industry | National focus - National focus - Hearts of Iron IV Note that thanks to that you won't be using the available construction slots in a. This section may contain outdated information that is inaccurate for the current version of the game. The last version it was verified State buildings · Shared buildings · Province buildings · Civilian factories. Originally posted by GamingOutkasts: Originally posted by Rexxar: what kind of slots? the building slots on states/providences. that I am not.