Thomas Jefferson, as president in 1803, purchased from France the huge Louisiana Territory, which doubled the size of the United States. As a result, the United States gained control of the Mississippi River and New Orleans to facilitate western trade. Jefferson authorized the Lewis and Clark expedition to explore the new territories that lay west of the Mississippi River. Sacajawea, an American Indian woman, served as their guide and translator.
The student will apply social science skills to understand major events in Virginia and United States history during the first half of the nineteenth century by a) explaining territorial expansion and its impact on the American Indians;
Early stages of territorial expansion