What mountain range helped to isolate Rome from invaders?

The 7 hills

Explanation:

These hills were a natural way that protected them from enemies, rather then Rome building walls to protect themselves.

classical republicanism, also known as civic humanism, is a form of republicanism  developed in the renaissance inspired by the governmental forms and writings of  classical  antiquity, especially such  classical  writers as aristotle, polybius, and cicero.

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