The ideas of exploration and expansion form the core of Undaunted Courageand the Lewis and Clark expedition. In 1790, the United States stretched only as far as the east bank of the Mississippi River. Though western lands were virtually unknown, they drew the interest of many Americans for several different reasons. At the opening of the nineteenth century, a pioneering spirit remained an integral part of the American character. Also, many people wanted to settle and farm their own land, but available lots were limited by increasing eastern populations. Further, a spirit of nationalism was growing, and many Americans came to believe that the United States should spread across the continent from the Atlantic to the Pacific Ocean. The Louisiana Purchase legally opened up vast quantities of land to American settlers, despite.....
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