Polisario Front was created in 1973.

Third World, yes. Country, no. Control of the region is disputed between Morocco and the Polisario Front.

frente polisario

No. Spanish Sahara was the last colonial possession of Spain, which it abandoned in 1975. It is now known as Western Sahara, and its status is disputed - both Mauritiania and Morocco claim it, while the Polisario Front wants it to become an independent nation.

El Aaiun or Laayoune (depends on whether you use the Spanish or French transliteration of the name of the city, which is al-3ayun in Arabic) is the largest city in Western Sahara. It is currently under Moroccan control, but it is claimed by the Polisario Front of Western Sahara as their capital.