By superpowers I think they mean the actual superpowers of the world, which at the time was Russia, America and China.
China and Russia were both communist countries so they got on pretty well (Stalin had supplied them with weapons and soldiers) however America didn't particularly get along with them as they were Capitalist and were following the Truman Doctrine which meant they had to prevent communism taking over other countries.
It was also said that America and China would do childish things during the peace talks, eg. America would have a bigger flag than China on the desk, and in the next talk China would position a bigger flag.
That's what the superpowers did which you could include in the answer (gives you marks for contextual knowledge). I didn't write a whole answer...sorry. But you basically have to state "I agree/disagree with this statement to some extent." Then start with why you agree/disagree and move onto an opposing point, try doing the opposing part two or three times to get most of the marks.
Like the person before me, statistics would be good.
(Oh and America was the only country to have, and have tested, atomic bombs until after WW2 when Russia had developed and successfully tested it. This could have caused a nuclear WW3 between the superpowers which no one had wanted.)
Hope this was some good and relevant info,
- p