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
History of Zanzibar slave trade was officially abolished in 1876, but slavery itself remained legal in Zanzibar until 1897. Zanzibar had the distinction of having the first steam locomotive in the African Great Lakes, when Sultan Bargash bin Said ordered a tiny 0-4-0 tank engine to haul his regal carriage from town to his summer palace at Chukwani. One of the most famous palaces built by the Sultans were the House of Wonders, which is today one of Zanzibar's most popular tourist attractions. The British Empire gradually took over; the relationship was formalized by the 1890 Heligoland-Zanzibar Treaty, in which Germany pledged, among