Green March
Before this invasion, the Western Sahara was in a process of decolonization from Spain. In which the indigenous population, the sahrawis, were claiming their independence. But, the Green March happening, this provoked a rejection from the natives towards what they consider "occupiers". The majority of Sahrawis united into the Frente Polisario to resist Moroccan occupation, starting a conflict that found a ceasefire agreement brokered by the United Nations in 1991.