Which best prevented the government from maintaining control at the end of the tang dynasty?

The enormous size of the empire prevented the government from maintaining the control.
Due to it's size, the residual part of the Tang Dynasty's conquest started to separate and form new societies
This occurrence, later on, lead to the creation of the five dynasties and the period of the Ten Kingdom in China

Iwould like a photo instead of all this and you can’t just go out asking for a paragraph thinking someone will be like oh yeah here it is