Scholars have focused on three factors to explain the decolonization process in the 20th century:

• The first is internal pressure, which can be evaluated at the local or regional level. Colonized peoples’ demands for reform and independence as well as the rise of anti-colonial political and nationalist movements can be considered as internal pressures against British, Dutch, and French colonial rule (Langenhove, 1961: 405, Betts, 2004: 37). The national politics of colonized powers were shaped upon these internal pressures. • The second is the inability and weakness of colonial powers to rule their colonies. World War II demonstrated that European colonial powers were no longer able to rule their African and Asian colonies. Fonseca and Marcos (2013: 209) argue that “if World War I helped to create local resistance movements against colonialism, it was World War II that destroyed the colonial system itself.” • The third factor is the external pressure which can also be expressed as effects made at the international level, including anti-colonial support from other states and international actors, including the United Nations (UN) (Kay, 1967: 787).