1. Which group of people did the Romans view as a threat to the empire?

The 1st real Threat was the Etruscan league.

Explanation:

There were conflicts before that(Latin wars). But By the 4th century BC, Etruscan's had formed an Alliance with some of the Celtic Tribes to the North. Becoming a major threat to Rome

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explanation:

. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.