On this day, 97 years ago, on December 29, 1928 (November 18, 1928 in the lunar calendar), Zhang Xueliang announced that he would change the flag and hang the green sky and white flag. Zhang Xueliang, who announced the change of the three eastern provinces, At the end of December 1928, Zhang Xueliang and others announced that the three northeastern provinces and Rehe would submit to the Nanjing National Government. On the 29th, Zhang Xueliang, Zhang Zuoxiang, Wan Fulin, and Zhai Wenxuan jointly called the whole country and announced that the three eastern provinces would "abide by the Three People's Principles, obey the National Government, and change the flag and change the flag" from now on. Tang Yulin, the Fenghuang warlord who ruled Rehe, listed Zhang Xueliang's "change flag" and put it on the electricity, and officially announced that from the same day, all organs, organizations, enterprises, and residents of Rehe Province would fly the green sky and white flag and belong to the On the 30th, the Nanjing National Government appointed Tang Yulin as the chairperson of the Jehol Provincial Government on the recommendation of Zhang Xueliang. On the 31st, the Nanjing National Government appointed Zhang Xueliang as the commander of the Northeast Border Guard. Fengtian changed its position, Jilin changed its position, Heilongjiang changed its position