Quick Note: The only reason that this answer is also in the comments is because no answering spots were open.
Answer:
1. Creation of the United Nations. After the fall of the failed League of Nations, the Allied countries formed the United Nations Organization in October 1945, at the of the war. The UN would be stronger and would have more scope than its predecessor.
2. End of colonialism and imperialism. With the fall of the Japanese empire, fascist Italy and Nazi Germany, these nations became democracies.
3. Economic crisis. As a result of an exorbitant spending on military power and resources, the warring countries were hit by a severe economic crisis. Germany, France and England filed for bankruptcy.
4. Geopolitical changes in Europe. All Axis countries lost extensions of their territory to pay compensation to the Allies. This caused a re-ordering of the world map. The USSR, for example, took countries from Eastern Europe and communism In these territories.
5. Emergence of the powers of the block: USA vs USSR. At the end of the war, the US and the USSR benefited because they did not suffer financial damage or damage to infrastructure, and managed to increase their industrial power and thus become world powers. This would initiate a new stage called the Cold War , Where these two nations competed for decades in the political, economic, social, scientific and even sports. This rivalry would last almost 50 years.
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