As long as the Innate Spiritual Energy is pervasive throughout Heaven and Earth, even a pig could cultivate into a fairy, let alone a human.
Therefore, as long as the Spiritual Energy of the Nine States continues to recover, even if Jiang Chen does nothing and does not teach the common people to cultivate, they are in such a favorable environment that every breath they take contains the pure Innate Spiritual Energy, and they would naturally become cultivators, thereby achieving the project of universal cultivation.
Food is paramount for the people!
With good food and drink, it's hard not to become immortal.
...
"Your Majesty, we roughly understand what you mean by Divine Cities, but we do not know how to build them. Please instruct us!"
The people only pondered for a while before they got the idea of building Divine Cities, which indeed was a wonderful thing; however, the problem was that they didn't know how to build them!