Flag of Zanzibar yellow cloves was added to the flag. On 12 January 1964, John Okello overthrew the Sultan of Zanzibar and adopted a black-yellow-blue tricolour as the flag of the People's Republic of Zanzibar and Pemba. On 29 January, the country's flag was changed to a blue-black-green tricolour with a thin white stripe at the hoist. This design, which was based on the flag of the Afro-Shirazi Party, was the longest-lived of the post-independence flags and eventually formed the basis for the current flag. On 26 April 1964, Zanzibar united with Tanganyika to form the new country of Tanzania and Zanzibar's old
Sultanate of Zanzibar Sadler was the first governor and commander in chief. There were occasional troubles with local tribes but the country was opened up by the Government and the colonists with little bloodshed. After the First World War, more farmers arrived from England and South Africa, and by 1919 the European population was estimated at 9,000 settlers. On 23 July 1920, the inland areas of the East Africa Protectorate were annexed as British dominions by Order in Council. That part of the former Protectorate was thereby constituted as the Colony of Kenya and from that time, the Sultan of Zanzibar ceased to