Fondo: Morocco virtually annexed the northern two-thirds of Western Sahara (formerly Spanish Sahara) in 1976, and the rest of the territory in 1979, following Mauritania's withdrawal. A guerrilla war with the Polisario Front contesting Rabat's sovereignty ended in a 1991 cease fire; a referendum on final status has been repeatedly postponed and is not expected to occur until at least 2002.