The area was historically the hunting grounds of the
Xiongnu, before being acquired by the
Han dynasty in BC 121. The ruins of the ancient city of
Khara-Khoto, founded by the
Western Xia, are located in Ejin. Ejin was incorporated into the
Mongol Empire under
Genghis Khan in 1226. During the
Yuan dynasty, the area was home to nomadic
Mongol populations. It was later incorporated into the
Qing dynasty (1644–1912). Under the
Republic of China, the area was under the jurisdiction of
Ningxia province. The area fell under the control of the
Communist Party in September 1949. Subsequently, it was placed successively under government commissions in
Jiuquan,
Zhangye, and Ningxia province. On June 1, 1956, Ejin became part of the
Bayannur League of the Inner Mongolia Autonomous Region. The
Jiuquan Satellite Launch Center was constructed at around the same time. On May 1, 1980, it became part of the Alxa League. Since the
Chinese economic reforms in the 1980s, Ejin rapidly developed its economy. By the early 21st century it became one of the fastest-growing counties in the country measured by GDP. ==Geography==