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Most historians do not accept the idea of a Dorian Invasion but, term it as a migration.
the invasion of the dorians other wise know as the sea people who invaded the myceneans
last time i checked, it was called the Dorian invasion
It started after the war with the invasion of the Dorian Greeks and the Sea Peoples
It populated the Peloponnese, then over-populated it, and so the Dorian city-states sent out colonies around the Mediterranean littoral.