Most of the people might regard China as a growing superpower. This may be true to some extent but as long as the United States control the battlefield there can be no other super power. In fact, Soviet Union was just a hoax and it was never as powerful as United States during any period of the cold war. And now China with a massive army and the world's largest airforce is struggling to even control their own waters. Chinese Navy has never seen combat, their equipments are poor, training sucks and their art of war is based on primitive philosophy. The nuclear weapons are real threat to the U.S but the American defence shield is soon to be in service and this should be able to shoot down any Chinese ICBMs and Satellites (with the exception of few Russian ones). So it looks as though the U.S is gonna maintain its role as the world's only superpower for a long time.