 The vast majority of the Congolese @-@ produced raw resources were exported to other Allied countries . By 1942 , the entire colony 's output of copper , palm oil and industrial diamonds were being exported to the United Kingdom , while almost all the colony 's lumber was sent to South Africa . Exports to the United States also rose from $ 600 @,@ 000 in early 1940 to $ 2 @,@ 700 @,@ 000 by 1942 . 
