Why should I upgrade my Factories, Workshops, and Smelters? How can I do that?

When you upgrade these districts, you will be able to process more of each resource.
To upgrade your Factory, Workshop or Smelter, you should perform the following activities:
1. Tap on the processing plant you want to upgrade.
2. Use the Upgrade option in the window that appears.
3. Press the Upgrade button again in the window that shows you the modernization requirements.
Wait until the modernization of the district is finished or speed it up.
Now your Factory, Workshop, or Smelter has been upgraded!
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