A. Where did the Serbians go?

Belgrade fell again in October 1915, as the Bulgarians made their way into Niš and Kosovo. All looked lost for the Serbs, so the decision was made to retreat through the mountains of Montenegro and Albania in the hope of making it to Greece, the nearest stronghold of Serbia's allies.

Explanation:

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popular sovereignty   influenced the declaration of independence because the colonists wanted to have freedom to do they wanted so they put into writing