linguistic:voice_change, structural:reformatting
French and British rule

With the defeat of Germany in World War I, Kamerun became a League of Nations mandate territory and was split into French Cameroon (French: Cameroun) and British Cameroon in 1919. France integrated the economy of Cameroon with that of France and improved the infrastructure with capital investments and skilled workers, modifying the colonial system of forced labour.

The British administered their territory from neighbouring Nigeria. Natives complained that this made them a neglected "colony of a colony". Nigerian migrant workers flocked to Southern Cameroons, ending forced labour altogether but angering the local natives, who felt swamped. The League of Nations mandates were converted into United Nations Trusteeships in 1946, and the question of independence became a pressing issue in French Cameroon.

France outlawed the pro-independence political party, the Union of the Peoples of Cameroon (French: Union des Populations du Cameroun, UPC), on 13 July 1955. This prompted a long guerrilla war waged by the UPC and the assassination of several of the party's leaders, including Ruben Um Nyobè, Félix-Roland Moumié and Ernest Ouandie. In the British Cameroons, the question was whether to reunify with French Cameroon or join Nigeria; the British ruled out the option of independence.