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The decision of Jefferson is often viewed as his greatest foreign policy success is The Louisiana Purchase.
Thomas Jefferson was an American statesman, lawyer, diplomat, and a Founding Father. H served as the third president of the United States from 1801 to 1809. The Louisiana Purchase doubled the size of the United States and is considered Jefferson's greatest diplomatic and foreign policy achievement. The Louisiana Purchase was the acquisition of the territory of Louisiana by the United States from the French First Republic in 1803. At the cost of fifteen million dollars, or approximately eighteen dollars per square mile, the United States nominally acquired a total of 828,000 sq mi in Middle America. It was significant as it greatly strengthened the country materially and strategically and provided a powerful impetus to westward expansion. It also confirmed the doctrine of implied powers of the federal Constitution.
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