TANZANIA-COLONIAL HISTORY 1498-1506-The Coast of East Africa that includes Zanzibar Archipelago  is taken over by the Portuguese after the Explorations of Vasco Dagama. Two Centuries later on 1698, Turkish Oman Empire defeats Portuguese Forces in their Third Attempt to Topple them out of Zanzibar. 1886-Germany and Britain sign the Anglo-German Treaty shortly after the infamous