How did the Moroccan military wall (The Berm) develop in Western Sahara?

The military wall emerged from a complex conflict that began as a bloody war between multiple parties in Western Sahara. By 1979, Mauritania withdrew completely from the territory, leaving the fight between Morocco and the Polisario Front (supported by Algeria). In 1981, Moroccan Armed Forces adopted a new strategic approach by constructing a series of walls and fortifications to separate their controlled areas of Western Sahara from territories they didn't control. This system of barriers, known as 'The Berm,' became Morocco's method of establishing territorial control in the ongoing dispute over Western Sahara.