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The official language of Togo is French because of the history of it. It has once been the colony of France and UK. And the following is the history.
On August 8, 1914, French and British forces invaded Togoland and the German forces there surrendered on August 26. In 1916, Togoland was divided into French and British administrative zones. Following the war, Togoland formally became a League of Nations mandate divided for administrative purposes between France and the United Kingdom. After World War I, newly founded Czechoslovakia was also interested in this colony but this idea did not succeed.
After World War II, the mandate became a UN trust territory administered by the United Kingdom and France. During the mandate and trusteeship periods, western Togo was administered as part of the British Gold Coast. In December 1956, the residents of British Togoland voted to join the Gold Coast as part of the new independent nation of Ghana.
By statute in 1955, French Togoland became an autonomous republic within the French union, although it retained its UN trusteeship status. A legislative assembly elected by universal adult suffrage had considerable power over internal affairs, with an elected executive body headed by a prime minister responsible to the legislature. These changes were embodied in a constitution approved in a 1956 referendum.