How to unlock state's building slots (to build more factorys)?

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No way currently. Number of available slots depends on the "development" of the state. Large cities have more, while deserts/tundra/island have fewer, or none.
 
so how do you progress past a National focus that presumably adds 2 slots and 2 factories, but tells you that you dont have enough slots to allow the factories in advance.Specifically, Italy, Industrial Effort II when Piemont is already using all 8 of the 8/25 unlocked slots.
 
You can most definitely increase building slots in a state a number of different ways. The most common is the industry techs concentrated or dispersed industry. They add 20% more per research level. You can also increase the build slots by 1 by spending 100 PP in a decision after you max the infrastructure to level 10. There are also a number of national focuses that increase building slots. Most come along with factories but some are just extra slots. I assume but have not tested that these slots add to the base so the industry techs will then increase off that.
 
As titled, thank you!
  1. National Focus
  2. Infrastructure level 10 unlocks decision for +1 slot (costs 100 PP), one-time use limited to cores
  3. Being at war unlocks another decision for +1 slot (costs 50, debases stab and WS by -2.5% each), one-time use limited to cores
  4. Industry tech grants +20% at each level, and beware that it's rounded down and i.e. for regions with base 6 (urban), going from level 4->5 grants 2 extra slots, compared to +1 previously.
 
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