To gear up economic growth, the second Rajah encouraged the migration of Chinese workers from China and Singapore to work in the agricultural fields. With proper economic planning and stability, Sarawak prospered and emerged as one of the world's major producers of black pepper, in addition to oil and the introduction of rubber plantations. He was succeeded by his son Charles Vyner Brooke but World War II and the arrival of Japanese forces ultimately brought an end to the Raj and the Protectorate administration, with the territory placed under a military administration on the Japanese capitulation in 1945, and ceded to Britain as its last acquisition as Crown Colony in 1946, against the Atlantic Charter. The area now forms the Malaysian state of Sarawak.