The fifty-six fortresses of Hua Xia Country primarily derive their economy from the miners at the bottom level.
They earn the lowest wages, yet create the most value.
But no one complains, because in this era, talent decides everything. For those at the bottom, mining is the means for the talentless to survive as the forsaken.
While the operations at the base level are similar, each fortress actually specializes in certain areas.
For instance, Fortress 39 emphasizes a comprehensive, well-rounded development. Fortress 2 is dedicated to the tertiary service industry.
Tang Xian and his group were about to head to Fortress 51, which was a heavy industry fortress.
Apart from the somewhat homogeneous first layer, from the second to the fourth layer in Fortress 51, the majority of street industries are involved in weapon processing.
This is also why the most excellent weapon designers would want to go to Fortress 51.
Because it represents the pinnacle of that field.