The Ottoman Empire was one of the caliphates of Islam in the past .
The expansion of the Muslim world involved various caliphates and empires , traders and conversion to Islam by missionary activities ( dawah ) .The preaching of Islam : a history of the propagation of the Muslim faith By Sir Thomas Walker Arnold , pg.125–258Most Muslims are of one of two denominations ; Sunni ( 85–90 % ) or Shia ( 10–15 % ) .
Islam