‘Yan'an’ charts Mao's time in Yan'an. During the civil war, the Chinese Communist Party (CCP) were anxious to build an alliance with the Guomindang against Japan. Soon after the civil war ended, the Japanese invaded. Yan'an was far from the fighting, allowing Mao to engage in academic study. Mao became leader of the CCP, and used the Rectification Movement to consolidate his authority. He strengthened his hold on power by becoming chairman of the Politburo. After Japan's surrender another civil war ensued. The CCP had the support of the peasants, and Mao formed the People's Republic of China.