题记:现今北京市辖区域,在抗战沦陷时期曾经分属三个伪政权:大部地区属于华北伪政权——北平伪“中华民国临时政府”(初期)和伪“国民政府华北政务委员会”(中、后期)——辖境,而长城以北部分则分属于张家口伪“蒙疆联合自治政府”和长春伪“满洲帝国”“热河省公署”辖境。延庆县当时处于伪蒙疆政权统治下。至于“蒙疆”一词的出现,早在1921年“东三省巡阅使”张作霖扩张势力到内蒙古地区——当时的热 Inscription: Nowadays, the areas under Beijing’s jurisdiction belonged to three pseudo-regimes in the period of the Anti-Japanese War: most of the areas belonged to pseudo-regimes of North China - the Puppet Government of the Peoples Republic of China, the “Provisional Government of the Republic of China” (initial stage) and the pseudo-government of North China Committee “(middle and later) - territory, and the north part of the Great Wall belongs to the Zhangjiakou pseudo ” autonomous government of Mongolia “and Changchun pseudo ” Manchurian Empire “” Rehe Provincial Office “jurisdiction territory. Yanqing County was under the rule of the Puppet Mongol regime. As for the emergence of the word ”Mongolia", as early as 1921, Zhang Zuolin expanded its power to the Inner Mongolia region in 1921