About 10 years ago if you compared the EU's total GDP it would be slightly higher than the US GDP.
Now the US GDP is about $25.46 Trillion per year
the EU is about $19.40 Trillion per year
What was the reason the US grew faster? as an American we have not had what felt like good economic performance over the last 10 years. I was surprised to learn that we have opened up a gap between our GDP output and the EU.