sentences:  After the Second Sino-Japanese War broke out in 1937, the Imperial Japanese Army quickly overran North China, and the Japanese Imperial General Headquarters authorized the creation of a collaborationist regime as part of its overall strategy to establish an autonomous buffer zone between China and Japanese-controlled Manchukuo.This government was based in Beijing, and proclaimed 
  Wang Kemin accepted the post of President of the Provisional Government of the Republic of China, with its capital in Beijing on December 14, 1937.The government nominally controlled the provinces of Hebei, Shandong, Shanxi, Henan and Jiangsu.