Between the 1920s and 1980s, many regions in Africa, Asia, and the Middle East gained independence from European imperial dominance through various processes. Decolonization occurred as Europeans withdrew from colonies, revolutions overthrew European rule, and non-violent independence movements succeeded. Factors like education, information, nationalism, and wars weakened European superiority and questioned colonialism, leading to new independent nation-states. However, problems from economic dependency to internal conflicts remained in some of the newly independent countries.