The Green March was a strategic mass demonstration in November 1975, coordinated by the Moroccan government and military, to force Spain to hand over the disputed, autonomous semi-metropolitan province of Spanish Sahara to Morocco. At that time, the Spanish government was preparing to abandon the territory as part of the decolonization of Africa, just as it had previously granted independence to Equatorial Guinea in 1968. The Sahrawi people aspired to form an independent state. The demonstration of some 350,000 Moroccans advanced several kilometres into the Western Sahara territory. Morocco later gained control over most of the former Spanish Sahara, which it continues to hold.
The Green March was condemned by the international community, notably in United Nations Security Council Resolution 380, as the march was considered an attempt to bypass the International Court of Justice's Advisory opinion on Western Sahara that had been issued three weeks prior.
Morocco gained control of most of the former Spanish Sahara, which it still holds to this day. The refusal of the Saharawi people to submit to the Moroccan monarchy gave rise to the Western Sahara conflict, still unresolved today, and whose main episode was the Western Sahara War.
Morocco, to the north of Spanish Sahara, had long claimed that the territory was historically an integral part of Morocco. Mauritania to the south argued similarly that the territory was in fact Mauritanian. Since 1973, a Sahrawi guerrilla war led by the Polisario Front (armed and financed by Algiers) had challenged Spanish control, and in October 1975 Spain had quietly begun negotiations for a handover of power with leaders of the rebel movement, both in El Aaiún, and with foreign minister Pedro Cortina y Mauri meeting El Ouali in Algiers.
Morocco intended to vindicate its claims by demanding a verdict from the International Court of Justice (ICJ), which was issued on 16 October 1975.