What led to the settlement information of independent states of Celtic peoples on the Balkan Peninsula spread leading to the defeat of the Mongols

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Explanation:

What led to the settlement and formation of independent states of Slavic peoples on the Balkan Peninsula by the A.D. 400s and 500s? They merged with Celtic and Germanic tribes. The river and estuary systems served as key trade routes. The mountainous terrain allowed them to resist invading armies.

Answer:

The mountains terrain allowed them to resist invading armies

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