Shortly thereafter, the attention of the government turned to the annexation of then Spanish Sahara from Spain, an issue on which all major domestic parties agreed.
However, in August 1974, Spain formally acknowledged the 1966 United Nations (UN) resolution calling for a referendum on the future status of Western Sahara and requested that a plebiscite be conducted under UN supervision.
Morocco assumed control over the northern two-thirds of the territory and conceded the remaining portion in the south to Mauritania.
However, buoyed by the increasing defection of the chiefs to its cause, the Polisario drew up a constitution and announced the formation of the Saharawi Arab Democratic Republic (SADR).
Morocco eventually sent a large portion of its combat forces into Western Sahara to confront the Polisario's forces, which were relatively small but well-equipped, highly mobile, and resourceful, using Algerian bases for quick strikes against targets deep inside Morocco and Mauritania as well as for operations in Western Sahara.