A report published by the Economist highlights that in some important areas China already has (see diagram below)
American anxiety wont be eased at the statistical graph below which shows the health or lack of the US economy and its over-reliance on China (especially in so far as purchasing its debt) is concerned.
>Some other statistical comparisons<
Also the Chinese economy would appear to more balanced in contrast to the US
Also the dominance of the US military in the Pacific region is been threatened by China as its military capability continues to grow
China's global reach is also expanding as its military arsenal increases in numbers
A wider statistical overview comparing China and the US
A couple of images for Americans (and the world) to ponder
And finally the all important question, on a GDP basis, when will the Chinese economy become larger than America?
On that question The Economist has projected based upon economic forecasts that China will overtake the US in 2019