Context: The Tibetan Empire emerged in the 7th century, but with the fall of the empire the region soon divided into a variety of territories. The bulk of western and central Tibet (Ü-Tsang) was often at least nominally unified under a series of Tibetan governments in Lhasa, Shigatse, or nearby locations; these governments were at various times under Mongol and Chinese overlordship. The eastern regions of Kham and Amdo often maintained a more decentralized indigenous political structure, being divided among a number of small principalities and tribal groups, while also often falling more directly under Chinese rule after the Battle of Chamdo; most of this area was eventually incorporated into the Chinese provinces of Sichuan and Qinghai. The current borders of Tibet were generally established in the 18th century.

Question: When were the current borders of Tibet established?
Answer: 18th century

Question: When did the Tibetan empire emerge?
Answer: 7th century

Question: Which Chinese provinces used to be the eastern part of Tibet?
Answer: Sichuan and Qinghai

Question: Which battle left parts of Tibet under Chinese rule?
Answer: Battle of Chamdo

Question: What empire emerged in the 18th century?
Answer: Unanswerable

Question: What central regions maintained a more decentralized indigenous political structure?
Answer: Unanswerable

Question: After what battle did Tibet fall under Mongol leadership?
Answer: Unanswerable

Question: What current feature was established in the 7th century?
Answer: Unanswerable