What measure are you using for "much more common"? According to the OECD data, the US is 7th for percent of population 16-64 with a post-secondary degree, and L

What measure are you using for "much more common"? According to the OECD data, the US is 7th for percent of population 16-64 with a post-secondary degree, and Luxembourg is the only western European country ahead of the US (the others are Canada, Russia, Israel, Japan, and South Korea). If you limit it to 25-34 year olds with at least a 4 year degree, the US falls to be in the middle of the pack compared to western Europe- behind Switzerland, the Netherlands, Belgium, Denmark, and the UK, but ahead of Norway, France, Spain, and Germany.