Migration Period - Wikipedia, the free encyclopedia.
The search term I used was "Volkerwanderung." The term seems to have fallen out of favor among academics, as it tends to emphasize racial tendencies that are viewed with alarm in Europe...
Anyway. The Wiki article turns into something a tail-chasing exercise, discussing dueling eggheads who want to argue over cause to the neglect of effect. (As opposed to the kind of egghead that wrote the OpEd I posted a link to yesterday, that spends so much time hand-wringing over the effect on part of the populace that they ignore the possibility of prevention and mitigation altogether.)
Anyway, let's hope Europe can get it's act together.