From Arteta and Emery to Alonso: Why does the Basque country produce so many top managers?

Mikel Arteta, Unai Emery and Xabi Alonso have two things in common: they’re Basque and they’re top-level managers. What’s behind this phenomenon?
Source : ESPN
Form more visit : https://www.espn.com/soccer/story/_/id/39293565/from-arteta-alonso-why-many-top-managers-basque