Qing Dynasty.
Ever since the mortal nations on Falling Sky Island were taken over by Fang Xi, the Cultivators of Nine State Sect gradually couldn't tolerate the troublesome scene of small countries and conflicting government orders. They began to consciously integrate the various dynasties.
First, based on the small countries, they formed the 'Greater Qing United Nation' to reclaim economic and military power.
Next, they started to promote education, planning to achieve complete unification and modernize the country after three generations.
In this way, they also kept the promises initially made to those monarchs.
It could be said that higher-level Immortal Cultivators, owing to their long lifespans, possess such patience.
Three generations, just a mere sixty years...