The Green Goblin
GDP isn’t the whole story. Have a look at the gross assets of the two countries. The difference is even more startling.
I can't seem to find any figures, would be interesting to see them if you can post them.
The average Chinese citizen earns $865 per year vs 33k for the states.
With a population of 300 million vs a billion China have a long way to go to catch the US!