Answer:
World War I was the first time since the Berlin Conference of 1884 that European colonial powers fought each other on a large scale, and not over issues related to their respective colonies.
This situation implied a general weakening of the European powers, which neglected the affairs of their colonies to dedicate their efforts to solve the war and the well-being of their nations. Therefore, this caused the colonial powers to lose power in Africa, thus starting anti-colonial movements that deepened after the Second World War. In addition, in the war itself, many countries, such as Germany, lost their colonies to other nations, which caused the inhabitants of the colonies themselves to lose a sense of belonging to their colonizers.