Why did tang dynasty collapse when they lost control over the silk road?​

When the An Lushan Rebellion ended in 763, the Tang Empire had once again lost control over its western lands, as the Tibetan Empire largely cut off China's direct access to the Silk Road. ... These lands contained crucial grazing areas and pastures for raising horses that the Tang dynasty desperately needed.

Explanation:

brainliest

b) brahmans   is nomadic society

either b) they were often feared and despised by other native cultures. or

c) their obsession allowed them to coexist with many other native cultures because of their peaceful nature.