Natives complained that this made them a neglected "colony of a colony". Nigerian migrant workers flocked to Southern Cameroons, ending forced labour but angering indigenous peoples. The League of Nations mandates were converted into United Nations Trusteeships in 1946, and the question of independence became a pressing issue in French Cameroun. France outlawed the most radical political party, the Union des Populations du Cameroun (UPC), on 13 July 1955. This prompted a long guerrilla war and the assassination of the party's leader, Ruben Um Nyobé, near Boumnyébel, the village where he was born. In British Cameroons, the question was whether to reunify with French Cameroun or join Nigeria.
On 1 January 1960 at 2:30 am, French Cameroun gained independence from France under President Ahmadou Ahidjo. On 1 October 1961, the formerly British Southern Cameroons united with French Cameroun to form the Federal Republic of Cameroon. Ahidjo used the ongoing war with the UPC to concentrate power in the presidency, continuing with this even after the suppression of the UPC in 1971.
His political party, the Cameroon National Union (CNU), became the sole legal political party on 1 September 1966 and in 1972, the federal system of government was abolished in favour of a United Republic of Cameroon, headed from Yaoundé. Ahidjo pursued an economic policy of planned liberalism, prioritising cash crops and petroleum exploitation. The government used oil money to create a national cash reserve, pay farmers, and finance major development projects; however, many initiatives failed when Ahidjo appointed unqualified allies to direct them.
Ahidjo stepped down on 4 November 1982 and left power to his constitutional successor, Paul Biya. However, Ahidjo remained in control of the CNU and tried to run the country from behind the scenes until Biya and his allies pressured him into resigning. Biya began his administration by moving toward a more democratic
