East Africa was composed of five British territories in eastern Africa that existed during the first-half of the twentieth century (about 1906 to 1952). The territories were Kenya, Tanganyika (now Tanzania), the Sultanate of Zanzibar and Pembra (also part of Tanzania), Uganda, and British Somaliland (now Somalia). These countries joined in a political and economic union that issued a common currency while each territory retained its autonomy.