At the end of the Second Sino-Japanese War and more widely World War II, the Chinese Communist Revolution took place within the context of the Chinese Civil War. The Chinese Communist Party, which was founded in 1921, was in conflict with the Kuomintang over the future of the country. Throughout the Civil War Mao Zedong developed a theory of Marxism for the Chinese historical context. Mao found a large base of support in the peasantry as opposed to the Russian Revolution which found its primary support in the urban centers of the Russian Empire. Some major ideas contributed by Mao were the ideas of New Democracy, mass line and people's war. The People's Republic of China (PRC) was declared in 1949. The new socialist state was to be founded on the ideas of Marx, Engels, Lenin and Stalin.