What caused the decline of the Carolingian empire following Charlemagne's death? OA. Invasions by Ostrogoths
OB. Invasions by Visigoths
OC. Invasions by Vikings
OD Invasions by Vandals

Invasions by Vikings

Explanation:

Increasingly faced with external threats – particularly the Viking invasions – the Carolingian Empire ultimately collapsed from internal causes, because its rulers were unable effectively to manage such a large empire.

churchill warned that the soviet union had cut eastern europe off from the west with an "iron curtain."

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explanation: