What sea lies to the south of Charlemagne's empire?

the Black Sea

It flows from southern Germany east into the Black Sea.

Explanation:

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norsemen from northern countries had made earlier journeys

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.