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Until recently it was assumed that Sardis was only settled in the period after the Anatolian and Aegean Dark Age, but American excavations have shown the place was settled in the Bronze Age and was a site of a significant population.[citation needed] If this is so, the Sherden, pushed by Hittite expansionism of the Late Bronze Age and prompted by the famine that affected this region at the same time, may have been pushed to the Aegean Islands, where shortage of space led them to seek adventure and expansion overseas. It is suggested that from here they may have later migrated to Sardinia. Guido suggests that