The city of Rome was located . A. in the Eastern Empire
B. in the Western Empire
C. on the northern border of the entire empire

 In the Western Empire

Explanation:

Beginning in the eighth century B.C., Ancient Rome grew from a small town on central Italy's Tiber River into an empire that at its peak encompassed most of continental Europe, Britain, much of western Asia, northern Africa and the Mediterranean islands.

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the authority to tax.