Because the US had a great geographical location which shileded them from immediate contact with any military force. This was one thing, another thing was that they were lending money to the different European nations which they had to return after some time. All of this enabled the US to catapult itself and become a world power.
<span>What he taught them was to drill with muskets, march in step, switch ranks, and to fight professionally</span>
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Americans feared Napoleon might back out of their offer of money for his land, preventing the U.S. from acquiring New Orleans area. They agreed and signed the Louisiana Purchase<span> Treaty on April 30, 1803. If this helps give a brainliest :-)</span>
The major reason Napoleon's invasion of Russia failed was because he attacked at the wrong time.
Granted, summer is generally the time used to start invasions against cold-weather countries (as seen by the invasion of France and Germany in their respective times). However, many of them did not think of a long-term fight, and were generally tied up in the western-half of Russia, before being beaten back by weather, shortages, and the Russians.
~<em>Rise Above the Ordinary</em>