During the 19 century, the federal government promoted westward expansion by using a variety of methods, such as purchase, cession, annexation, war or treaty. This expansion changed the shape and character of the country. More and more territory lead the United States became one of the largest countries in the world. In 1803, President Thomas Jefferson bought the Louisiana Territory from France for 15 million dollars. At that time, France was busy to control the whole of Europe and had…
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