What was one factor that eventually led to the demise of the Tang Dynasty?

The An Lushan Rebellion was a devastating rebellion against the Tang dynasty of China; it significantly weakened the dynasty. The power of the jiedushi, or provincial military governors, increased greatly after imperial troops crushed the rebels, taking administrative power away from the scholar-officials.

Explanation:

executive, (president and about 5,000,000 workers) legislative (senate and house of representatives) and judicial (supreme court and lower courts)

explanation:

the name of the theory is landmass theory.