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At it's most expansive, the Roman Empire was about 5 million square kilometers (2 million square miles). The United States is far larger, at 9.8 million square kilometers (3.8 million square miles).
Best Answer: The Roman Empire knew it's (territorial) peak during the reign of Emperor Hadrian and the estimated size of the Roman army most probably formed a standing force of 375,000 men. This estimate probably included only legionary and auxiliary troops of the Roman army and not the navy, military engineers etc.