Although Sun is considered as one of the greatest people in modern China, his political life was one of constant struggle and frequent exile. After the success of the revolution, he quickly fell out of power in the newly-founded Republic of China, and led successive revolutionary governments as a challenge to the warlords who controlled much of the nation. Sun did not live to see his party bring about consolidation of power over the country. His party, which formed a fragile alliance with the Communists, split into two factions after his death. Sun's chief legacy resides in his developing a political philosophy known as the Three Principles of the People (nationalism, democracy, and the people's livelihood/welfare).