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In page History of Western Sahara:

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On February 27, 1976, the Polisario Front formally proclaimed the Sahrawi Arab Democratic Republic and set up a government in exile, initiating a guerrilla war between the Polisario and Morocco[citation needed], which continued until a 1991 cease-fire. As part of the 1991 peace accords, a referendum was to be held among indigenous people, giving them the option between independence or inclusion within Morocco. To date the referendum has never been held because of questions over who is eligible to vote.