During World War I, British forces invaded and occupied German Kamerun. After the war, on June 28, the League of Nations established the mandate system. For German colonies in Central Africa, the League of Nations forcibly placed these lands and populations under another country’s administration. German Kamerun was split into two territories—the northern region was placed under British rule and the remaining southern region (about four-fifths of German Kamerun) was placed under French rule. The two territories were placed under United Nations (UN) Trusteeship in 1946, but they were still administered by French and British imperialist Governments.