How has physical geography gave the US power?

United States were and are psychically divided from the rest of the world. That is why for a long period of time they were not engage in any conflict on their territory. Even when they waged wars, it was on the territory of some other country.

Explanation:

Physical Isolation, helped with politics of isolationism enabled United States to develop as a leading force in the world. By using their resources and constantly spreading their territory to the West, they strengthened themselves from the inside, without being disturbed for a longer period of time by any other country.

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the thirteen colonies are:

connecticut, delaware, georgia, maryland, massachusetts, new jersey, new york, new hampshire, north carolina, pennsylvania, rhode island, south carolina, virginia