How has physical geography most impacted the role of the United States throughout history?
Due to physical geography and the location of the U.S., the country has never looked beyond the oceans or its shared borders with Canada and Mexico.
Prior to 1900, the country was isolated from other countries but in the early 1900s was forced into global affairs with the advent of better transportation .
Since independence, the U.S. has always been heavily involved in the affairs of other world regions due to its proximity to nearly every other continent.
Until the mid twentieth century, the U.S. remained largely isolated from world affairs due to the natural buffer provided by the Atlantic and Pacific Oceans.
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