There are other industrialized nations besides those in Europe, some with population much bigger the the US? Hence my use of the word large. I was thinking more of China, India, Russia, Brazil.
All four of those are considered developing economies, not developed economies (as the US and western Europe). There's a reason they're often grouped together as the the BRIC economies (sometimes with South Africa as BRICS).
Maybe because it's comparing the entirety of the United States with much smaller countries like Italy and Spain.
A comparison of the United States with the European Union would make more sense.