Who would have imagined even fifteen years ago that a notion of "EU citizenship" would come to occupy center-stage in the arena of EU legal developments and widely permeate fields of EU law to which citizenship at the EU level long appeared to have little to say? By contrast, Member State citizenship lay at the heart of things from the start, as rights and obligations alike seemed to turn, at least largely, on whether an interested person bore the citizenship or nationality of a Member State.
European Law | Law
George A. Bermann,
Colum. J. Eur. L.
Available at: https://scholarship.law.columbia.edu/faculty_scholarship/3636