I agree with most of your points, and the huge unified, and rather homogeneous market is a core advantage of the US in certain product categories. Since you mention SAP: clearly, SAP is successful in a space where Europe's heterogeneity should be a problem -- different legal systems, different accounting rules etc ... and yet SAP succeeded. Maybe it was because SAP was founded in 1972, half a century ago, when European decline was not as pronounced as it is in today?