Why did the ancient Romans call the Mediterranean Sea
”our sea”?

The term mare nostrum was used in the first place by Romans to refer to the Tyrrhenian Sea. This was after they had taken over the countries around it. ... So they started to use the name mare nostrum for the whole Mediterranean Sea. They used other names as well, such as Mare Internum ("The Internal Sea").

Explanation:

the results of roman expansion produced social conflict and civil war. julius caesar gained power and became a dictator but was then assassinated. the reign of augustus began a long period of imperial rule and peace in the roman empire. rome faced the problems of how to maintain peace, law, and order.

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