How did Augustus protect Rome's borders?

The reign of Augustus from 27 BCE to 14 CE brought peace and security to both politics and trade. The Roman Senate granted Augustus almost unlimited powers, bringing reform to both the city and provinces. He became the “first citizen” or princeps, thus initiating the principate.

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the big stick policy was to still look powerful, and be nice at the same time. the big stick policy was also to countries who were at war, find peace with eachother.

the dollar diplomacy was to expand american business and get it to latin america, for that would be good for the economy.

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i hope this your understandings.