Today, 113 years ago, on February 13, 1912 (Lunar Calendar, December 26, 1911), Sun Yat-sen resigned as interim president. After the success of the Wuchang Uprising on October 10, 1911, he returned from Europe to Shanghai on December 25, and was elected as interim president at the 16th provincial congress on the 29th. On January 1, the following year, he took office in Nanjing, forming the interim government of Nanjing in China. During his tenure, the first Constitution of China, the Interim Law of the Republic of China was promulgated. On February 13, under the persecution of imperialism and feudal forces, he resigned as interim president, and was taken over by Yuan Qing Qing. On February 15, Sun Yat-sen and all state members were promoted to Yat-sen, Yat-sen,