Name several unions of the tribes of the Eastern Slavs that developed by the 9th century AD.

On the territory of Eastern Europe by the 9th century, there were a large number of Slavic tribes, which were united in such unions: Antes, Wends and Sklavens. Antes and most of the Wends later entered Kievan Rus. This happened during the formation of the state – the 9th century.

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