Formed on May 12, 1936, the Mongol Military Government (蒙古軍政府) had Prince Yondonwangchug of Ulanqab as its first chairman. It was renamed in October 1937 as the Mongol United Autonomous Government (蒙古聯盟自治政府). On September 1, 1939, the predominantly Han Chinese governments of South Chahar and North Shanxi were merged with the Mongol United Autonomous Government, creating the new Mengjiang United Autonomous Government (蒙疆聯合自治政府). The capital was established at Zhangbei (Changpei), near Kalgan (Zhangjiakou), with the government's control extending around Hohhot. On August 4, 1941, it was again renamed: the Mongolian Autonomous Federation (蒙古自治邦).