▁Kingdom , ▁the ▁UK ▁ended ▁the ▁Prote ctor ate ▁and ▁made ▁provision ▁for ▁full - self ▁government ▁in ▁Z anz ib ar ▁as ▁an ▁independent ▁country ▁within ▁the ▁Commonwealth . ▁Upon ▁the ▁Prote ctor ate ▁being ▁abol ished , ▁Z anz ib ar ▁became ▁a ▁constitution al ▁mon archy ▁under ▁the ▁Sultan . ▁Sultan ▁Jam sh id ▁bin ▁Abd ul lah ▁was ▁over th rown ▁a ▁month ▁later ▁during ▁the ▁Z anz ib ar ▁Revolution . ▁Jam sh id ▁fled ▁into ▁ex ile , ▁and ▁the ▁Sultan ate ▁was ▁replaced ▁by ▁the ▁People ' s ▁Republic ▁of ▁Z anz ib ar ▁and ▁P emb a . ▁In ▁April ▁ 1 9 6 4 , ▁the ▁existence ▁of ▁this ▁social ist ▁republic ▁was ▁ended ▁with ▁its ▁union ▁with ▁Tang any ika ▁to ▁form ▁the ▁United ▁Republic ▁of ▁Tang any ika ▁and ▁Z anz ib ar , ▁which ▁became ▁known ▁as ▁T anz ania ▁six ▁months ▁later . ▁ ▁Dem ograph ics ▁By ▁ 1 9 6 4 , ▁the ▁country ▁was ▁a ▁constitution al ▁mon archy ▁ruled ▁by ▁Sultan ▁Jam sh id ▁bin ▁Abd ul lah . ▁Z anz ib ar ▁had ▁a ▁population ▁of ▁around ▁ 2 3 0 , 0 0 0 ▁n atives , ▁some ▁of ▁whom ▁claimed ▁Pers ian ▁ancest ry ▁and ▁were ▁known ▁locally ▁as ▁Sh ira z is . ▁It ▁also ▁contained ▁significant ▁minor ities ▁in ▁the ▁ 5 0 , 0 0 0 ▁Arab s ▁and ▁ 2 0 , 0 0 0 ▁South ▁A si ans