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After WW2: The Soviet Union was one of the two most powerful countries in the world.
Now: The Soviet Union is no longer a country.
Video: https://www.youtube.com/watch?v=RVBVjIAMo8c
Article: http://www.coldwar.org/articles/90s/fall_of_the_soviet_union.asp

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After WW2: The superpowers were the United States of America and the Soviet Union.
Now: The superpowers are the United States of America, Russia, China, India, and the European Union.
Video: https://www.youtube.com/watch?v=0pr4BQPS9zU
Article: http://gazettereview.com/2016/01/most-powerful-countries-in-world/

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After WW2: The United States was the only country that possessed nuclear weapons.
Now: Nine countries possess nuclear weapons.
Video:
https://www.youtube.com/watch?v=cvkxkZ-yWos
Article: http://www.icanw.org/the-facts/nuclear-arsenals/