In 1895 a coup he plotted failed, and for the next sixteen years Sun was an exile in Europe, the United States, Canada, and Japan, raising money for his revolutionary party and bankrolling uprisings in China. In Japan, where he was known as Nakayama Shō (Kanji: 中山樵, lit. The Woodcutter of Middle Mountain), he joined dissident Chinese groups (which later became the Tongmenghui) and soon became their leader. He was expelled from Japan due to fears of the large level of support he had there and went to the United States.

On October 10, 1911, a military uprising at Wuchang in which Sun had no direct involvement (at that moment Sun was still in exile and Huang Xing was in charge of the revolution), began a process that ended over two thousand years of imperial rule in China. When he learned of the successful rebellion against the Qing emperor from press reports, Sun immediately returned to China from the United States. Later, on December 29, a meeting of representatives from provinces in Nanjing elected Sun as the provisional President of the Republic of China and set the January 1 of 1912 as the first day of the First Year of the Republic. This republic calendar system is still used in Taiwan today.
 

The official history of the Kuomintang (and for that matter, the Communist Party of China) emphasizes Sun's role as the first provisional President, but many historians now question the importance of Sun's role in the 1911 revolution and point out that he had no direct role in the Wuchang uprising and was in fact out of the country at the time. In this interpretation, his naming as the first provisional President was precisely because he was a respected but rather unimportant figure and therefore served as an ideal compromise candidate between the revolutionaries and the conservative gentry.

However, Sun is credited for the funding of the revolutions and for keeping the spirit of revolution alive, even after series of failed uprisings. Also, as mentioned, he successfully merged minor revolutionary groups to a single larger party, providing a better base for all those who shared the same ideals.

Sun is highly regarded as the National Father of modern China. His political philosophy, known as the Three Principles of the People, was proclaimed in August 1905. In his Methods and Strategies of Establishing the Country completed in 1919, he suggested using his Principles to establish ultimate peace, freedom, and equality in the country.