So when you said "强大", what do you refer to? Size of wallet? Morality? degree of civilization? Modernization of social science?
America is powerful not because they have wealth but they are very rich in ideals and other social stuff.
Think about it : why even a despot country like North Korea use the word "democratic" in its country's name. If they truly and sincerely believe what they are doing, they should have used and advocated "totalitarian" wholeheartly instead of copying its enemy's
To be powerful, you must contribute something to world civilization to make it more advanced. US made many constributions like democracy. Since world war II, many more countries have become democratic. America did soemthing right. They advanced their country from very backward to the most powerful country in a short time period. I believe that people from all over the world look up to America not only because it means opportunities but because it caught their hearts
China must give something to the world that can catch people's hearts and can lift world civilization to higher level. If they can not do that, no matter of how much money they have, they can not lead.
In fact, I think that if china wants to be powerful country, they have to solve communist issue. The world simply can not have a powerful country in this century which is communist. Some argue that now china is not communist. well then change its name.