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alternatehistory.com
What the title says pretty much. What are cool/interesting alternate Migrations you can think off. I'm think of mainly Migration Era, but any good ones before or after that are welcome!
Some I've got:
Huns move into Central Europe permanantly
Goths remain around the Black Sea
Franks expand East
Bretons cross into Holland
Vandals continue east across North Africa
Any others? And what could the butterflies from these be?