History of Bortala
The Tang dynasty created the Shuanghe Protectorate in this area. During the Yuan and Ming dynasties the area was the territory of the Oirats. Chahar Mongols were moved here during the Qing dynasty from Kalgan, while Torghuud Oirats moved eastwards from the Volga.
The China established the autonomous prefecture on July 13, 1954.
Source From: https://en.wikipedia.org/wiki/Bortala_Mongol_Autonomous_Prefecture#History