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History
The island was settled by Arab traders in the 7th century. It was occupied by the Portuguese in the 16th century, became a sultanate in the 17th century, and was under British protection 18901963. Until well into the 19th century the island was a major centre for the slave trade. Together with the island of Pemba, some nearby islets, and a strip of mainland territory, it became a republic in 1963. It merged with Tanganyika as Tanzania in 1964.
Blue is the colour of the People's United Party. Sub umbra floreo, ‘I flourish in the shade’, is the national motto. Effective date: late 1980s.
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