Lewis and Clark

Section Summary

In 1803, Thomas Jefferson appointed Meriwether Lewis to organize an expedition into the Louisiana Territory to explore and map the area but also to find an all-water route from the Missouri River to the Pacific Coast. The Louisiana Purchase and the journey of Lewis and Clark’s Corps of Discovery captured the imagination of many, who dedicated themselves to the economic exploitation of the western lands and the expansion of American influence and power. In the South, the Adams-Onís treaty legally secured Florida for the United States, though it did nothing to end the resistance of the Seminoles against American expansionists. At the same time, the treaty frustrated those Americans who considered Texas a part of the Louisiana Purchase. Taking matters into their own hands, some American settlers tried to take Texas by force.

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