After the last fight with a Martial Artist in Datang Region causing the Empire's ruling class realized that the threat of Martial Artists is closer than expected. Also, now the seven major sects are in chaos with the Great Martial Artists Battle.
This was an excellent opportunity to create an opportunity for the Empire to overgrow. Zhao Lingxin had already seen the country's future that there must be a complete unification of all the Eastern territories. By that time, the Empire would have a power that was equal to the seven major sects. The size of the land, priceless resources, and population were what the Empire needed the most.
The turbulent period of the seven major sects was the best chance for the Empire to expand with ease.