The Great Leap Forward, launched in 1958, was Mao Zedong's ambitious plan to rapidly industrialize China through mass mobilization and collectivization. This campaign led to widespread famine, economic disruption, and an estimated 20-45 million deaths, making it one of history's deadliest man-made disasters. The Sino-Soviet split, emerging during this period, marked a deterioration in relations between China and the Soviet Union. Ideological differences, disagreements over development strategies, and the withdrawal of Soviet assistance in 1960 contributed to this rift, reshaping China's foreign policy and global alliances.