Naval Dockyards are used for building ships.

Military Factories are used for everything from planes to rifles and tanks.

Synthetic Refineries - which each produce 1 Rubber and 2 Oil.

Nuclear Reactor - producing new nuclear bombs.

Rocket Test Sites - allows deployment of rockets.

Welcome to another developmentdiary for Hearts of Iron IV! Today we'll talk about the industrial buildup...In all previous iterations of the Hearts of Iron series, we’ve had something called Industrial Capacity, but, as we mentioned back in Dev Diary 5, we have splitted that into Military Factories, Civilian Factories and Naval Dockyards.Civilian Factories are used for trade, consumer goods & all types of buildings.There are also another few buildings which are categorised as factories when it comes to rules.So how does the industrial buildup work in Hearts of Iron IV?First of all, each state has maximum capacity of factories it can have, depending on its population and infrastructure. There are some focuses or events that may extend that cap, but this is the limit you have to plan about.You can always destroy a factory if you want to, and there is also the possibility to convert a civilian factory to military use, and back.The speed of building new buildings like bases, forts and factories depends on your total level of civilian factories in your country, where up to 15 is used on one project at a time.One difference from Hearts of Iron 3 is that damaged industry needs to be repaired using your own industry instead of being free repairs over time. As well as being more realistic it also make the impact of strategic bombing matter a lot more.Here's a screenshot of New York which has 2 military factories, 9 civilian factories and 3 naval dockyards. They have the capacity to build 2 more factories with current infrastructure, and if that is improved they reach the maximum of 20 buildings, due to their high population. As a compaison South Carolina only have population for 11 factories, Corsica for 2 and Gotland for 0!Next week, we’ll go into details about trade.