West Africa Ivory Coast, and a succession of military coups in Ghana and Burkina Faso. Since the end of colonialism, the region has been the stage for some brutal conflicts, including: The Economic Community of West African States, established in May 1975, has defined the region of West Africa since 1999 as including the following 15 states: Geopolitically, the United Nations definition of Western Africa includes the preceding states with the addition of Mauritania (which withdrew from ECOWAS in 1999), comprising an area of approximately 6.1 million square km. The UN region also includes the island of Saint Helena, a British overseas
British West Africa colonial banking often disadvantaged the colonies as producers of commodities. Even after its final dissolution, a single currency, the British West African pound, was in effect throughout the region—including Nigeria—from 1907 to 1962. Nigeria gained independence in 1960. Sierra Leone was self-governing by 1958 and gained independence in 1961. Gambia gained independence in 1965. In 1954, the British Gold Coast was allowed by Britain to self-govern and in 1957, the Gold Coast was given independence from Britain, under the name Ghana. British West Africa British West Africa was the collective name for British colonies in West Africa during the colonial