Mr. Zhang Xueliang and Inner and External Factors of the "Banner-changing of Northeastern China

The Banner changing of Northeast is a critical event in the history of the Republic of China, which not only safeguarded the unification of the nation but also dealt a heavy blow at the Japanese plan of invading Northeast China. To work out the causes of the event, Mr. Zhang Xueliang's personal efforts stimulated by his patriotism come in the first place. Meanwhile, the hope of the people of Northeast China for unification, the pressure and lures from the Nanjing Kuomintang government and the restriction of the Japanese force from American and British imperialist countries are very important factors as well.