How does the united states gdp compared with the rest of the world?

Compared to the rest of the world, the US has the highest gdp of all countries. The number fell down drastically since world war 2, but the country still stays at the number one position.

Iam pretty sure it is c. 2000 bce

Answermost of the time it would be ground into fine sediment,and sometimes they are carried away from the original location;