Thirty-four years ago today, on September 6, 1991 (July 28, 1991 lunar calendar), Morocco and the Western Sahara People's Front reached an official ceasefire. Western Sahara was once a Spanish colony. In May 1973, the Western Sahara People's Front (POLISARIO Front) was established and announced that it would achieve independence of Western Sahara by force. In February 1976, after Spain withdrew from Western Sahara, Morocco and Mauritania signed a partition agreement, stipulating that the north of Western Sahara was under the jurisdiction of Morocco and the south was under the jurisdiction of Mauritania. The Western Sahara People's Front announced the establishment of the Saharan Arab Democratic Republic. Since then, armed conflicts have broken out between Morocco and Mao and the Western withdrawal People's Front. In August 1979, Mauritania announced that it would give up its territorial claims to Western Sahara and withdraw from the Western withdrawal war. Since then, the armed conflict has been concentrated in the northern part of Western Sahara and the southern border of Morocco, and the scale of the war has been expanding. The Western Sahara War has aroused the concern of the international community. The Organization of African Unity and the United Nations have actively mediated and mediated many times to promote the peaceful settlement of the Western Sahara issue. In October 1986, the United Nations General Assembly adopted resolutions on a ceasefire in Western Sahara, a referendum and self-determination for Western withdrawal. In January 1989, the warring parties held their first direct dialogue. In June, the United Nations established the Western Sahara Peace Plan Implementation Team. In May 1990, the United Nations established the Western Sahara Referendum Monitoring Group. In June, the UN Security Council adopted the Western Withdrawal Peace Plan. In July 1991, Morocco and the Western Sahara People's Front signed a ceasefire agreement. The two sides agreed to implement a formal ceasefire on September 6. A referendum will be held in January 1992 under the supervision of the United Nations to finally determine the ownership of Western Sahara. At that time, the United Nations will send a peacekeeping force composed of 36 countries to organize and supervise the self-determination referendum of Western Sahara citizens. On September 6, 1991, the head of the first batch of personnel of the United Nations Observer Mission for Western Sahara, General Lero of Canada, announced in Laayoune, the capital of Western Withdrawal, that Morocco and the Western Sahara People's Front had officially achieved a ceasefire. The 15-year armed conflict between the two sides finally ended.