During the Second Sino-Japanese War, the area was occupied by Japan and the university was moved to Chengdu in Sichuan. After the People's Republic of China was established in 1949, Yenching University remained open, although under control of the Chinese Communist Party. In 1952, after the entry of China into the Korean War, its some arts and science faculty were shifted into Peking University and other state-operated institutions, its politics and law faculty were shifted into China University of Political Science and Law, its economics faculty were shifted into Central University of Finance and Economics, its sociology faculty were shifted into Minzu University of China, and other faculty shifted into other institutions. At the same time, its engineering section was merged with Tsinghua University, and Peking University obtained the former Yenching campus. In 1952 Peking University moved from central downtown Beijing to the previous Yenching campus in the city's Haidian District.