Prevent the Zanzibari Revolution. Perhaps the British keep a battalion of Royal Marines on the island at a small naval base as a relic of colonialism. When the attempted coup begins, the British troops march against them and with their much better training smash the revolutionary forces. The Sultan, with Anglo-American aid, imposes a royal dictatorship. Over the next few decades, the government changes the island's demographics by expelling troublesome Africans to Tanganyika and importing Arab and Muslim South Asians to the island with offers of land and jobs, particularly in the security forces (all subsidized with Western and Gulf Arab aid). The Sultanate, with open markets with the West, also manages to gain some light manufacturing and a small banking sector that specializes in African investments. By the end of the Cold War, the island's Afro-nationalists have given up union with Tanganyika as a goal, instead advocating for a multiethnic democracy and close relations with African states as part of a political alliance with the island's liberals and social democrats.