World War II added major powers to the United States and created diplomatic relations between the US and the Soviet Union.
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References
- https://academic.oup.com/maghis/article-abstract/18/5/18/1009044
- https://api.taylorfrancis.com/content/books/mono/download?identifierName=doi&identifierValue=10.4324/9780203500095&type=googlepdf