Colonization or decolonization usually refer to European countries which during a certain number of centuries conquered and occupied wide territories around the world using their relatively advanced capacities of creating tools and mechanisms of dominating others.
Western Sahara is not presently a European colony but Moroccan since the Green March of November 1975 by thousands of Moroccans. That March made official the occupation of that territory by the Kingdom of Morocco. This happened after the Spanish moved out to deal with their own political problems at home.
The territory is that still under foreign occupation which is not much talked about in mainstream media. In recent years, and particularly during the past months this being the case, the UN alongside other international institutions such as the International Criminal Court, have been inefficient in achieving what they were initially and officially created for, i.e. peace and justice.
Presently these institutions are more seen as a form of persistent colonialism of the past than anything else. They stand and only pursue the interests of those who created them. If this was not the case, Western Sahara would not have been under a UN mandate for so many years.
Western Sahara has fallen victim of its present Moroccan occupant and past colonizers acting through mentioned institutions and many others which for example benefit directly or indirectly from the resources extracted from its soil.
Current African leaders have on their part failed the people of Western Sahara. They are more in tune with foreign interests than those of their people. The spirit of African independence has faded away with time. A new generation of freedom fighters is needed.
For more on that African territory, please read a current picture of the Western Sahara under the analysis from Africa Energy.