As we all know, the Uighurs formed a large empire in the 8th and 9th centuries which at it's height, reached from Silla (OOC: TTL's term for Korea) in the east to the shores of the Mediterranean in the west, controlling most of Zhongguo, Transoxiana, Persia, Bactria, Mesopotamia, and Syria at it's height in 865, but what if there was no Great Uighur Empire? Would Manichaeism still have become one of the world's great religions without Uighur patronage of the faith with some Uighur Khagans adhering to Manichaeism? How would Zhongguo, Bharat, Dar al-Islam, Persia, and Rhomania (they defeated the Uighurs in 857 when they tried to invade Rhomania) have been affected if the Uighurs hadn't become an Empire? Would the Tang Dynasty have fallen from within due to either peasant revolts or ambitious generals (or a combination of both) or would another group of nomads have overthrown the Tang Dynasty?