The European Union is the Greatest Economy in the World. Will USA catch up?

[SamuelRSmith]

^Which provides the nations with a larger labour force.

EDIT: If you look at this graph (http://upload.wikimedia.org/wikipedia/en/timeline/c9bd270b536dad628c33caa5b397d3e3.png) you'll see that Turkey accession has been in negotiations for some time.