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Compare the size of countries, regions and cities

Roman Empire (117AD) is 0.51 times as big as United States

Roman Empire (117AD)

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United States

The United States of America (USA), commonly known as the United States (U.S. or US) or America, is a country located primarily in North America, consisting of 50 states, a federal district, five major self-governing territories, and various possessions. At 3.8 million square miles (9.8 million square kilometers), it is the world's third- or fourth-largest country by total area.