Morocco virtually annexed the northern two-thirds of Western Sahara (formerly Spanish Sahara) in 1976, and claimed 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 UN-brokered cease-fire; a UN-organized referendum on the territory's final status has been repeatedly postponed. In April 2007, UN-sponsored talks between representatives from the Government of Morocco and the Polisario Front to negotiate the status of Western Sahara, which stalled in April 2008, resumed in August 2009. Rabat has put forward an autonomy proposal for the territory, which would allow for some local administration while maintaining Moroccan sovereignty. The Polisario, with Algeria's support, demands a popular referendum that includes the option of independence.