A side issue is the lack of people studying the history of other EU countries. For any given EU country there are far more posts in the US than there are in all the EU put together outside the country in question.
If I'm evil minded, I could suggest, that the lack of willingness to accept foreign historicians is the fear they may express opinions differing from the dominating view... Der Amerikaner ist die Orchidee unter den MenschenVolker Pispers
As they say, the plural of anecdote is not data but bullshit. When the capital development of a country becomes a by-product of the activities of a casino, the job is likely to be ill-done. — John M. Keynes