What was supposed to have been learned from World War II?

the first was that war was to be avoided at all costs, the second was that democracies had to be ready to resist aggression. The second lesson led most western European states, including Germany, to rearm and join the Atlantic alliance.

Explanation:

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the mother countries succeed in doing that by using the colony's natural resources, facilities in a colony, they do not take good care of these facilities, causing them to fail. this has had negative and positive effects on the people of africa, they then governed through direct or indirect rule depending on the country.

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