Daniel Mitchell has a superb picturesque post comparing Europe with US.
It first looks at which US States are richer/poorer than European countries. Does not look good for Europe. Germany the richest pean country is ranked 39th in the ranking.
Then there is a Europe map which colors the countries as purple and yellow. Purple ones are as rich as US states and Yellow ones are poorer than Mexico. Again only a handful are in purple and most are yellow.