the zanzibar revolution Change_of_leadership ( `` thawra unk '' ) occurred Coming_to_be in 1964 and led to Causation the overthrow Change_of_leadership of the sultan of zanzibar and his mainly arab government by local african revolutionaries .

the north yemen civil war Hostile_encounter ( , `` thawra 26 unk '' , `` 26 september revolution Change_of_leadership '' ) was fought Hostile_encounter in north yemen from 1962 to 1970 between royalist partisans of the unk kingdom and supporters of the yemen arab republic .