Lewis & Clark
The route of the Corps of Discovery
(Source: Wikimedia Commons)
When Thomas Jefferson commissioned the Corps of Discovery
A) all of the Pacific Northwest region was part of the U.S. because of the Louisiana Purchase
B) no European had reached the west coast of North America by traveling overland
C) the headwaters of the Missouri River had already been discovered and mapped
D) the idea of finding a water route across North America had been abandoned
E) Spain, Great Britain, and the U.S. all had interest in the territory in what is now Washington and Oregon
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