Variation of Marxism and Leninism developed by Mao Zedong. It diverged from its antecedents in its agrarian focus: Mao substituted the dormant power of the peasantry (discounted by traditional Marxists) for the urban proletariat that China largely lacked. The Maoist faith in revolutionary enthusiasm and the positive value of the peasants' lack of sophistication as opposed to technological or intellectual elites fueled the Great Leap Forward of the 1950s and the Cultural Revolution of the 1960s and '70s. The disastrous consequences of both upheavals led Mao's successors to abandon Maoism as counterproductive to economic growth and social order. Maoism was embraced by insurgent guerrilla groups worldwide; under the Khmer Rouge it became Cambodia's national ideology.