The answer to the question: Who commissioned the Lewis and Clark expedition in 1804, would be: Thomas Jefferson.
Explanation:
The Lewis and Clark Expedition, also known as the Corp of Discovery Expedition, led by Meriwether Lewis and William Clark, took place between 1804 and 1806, and it was commissioned by Thomas Jefferson after the purchase of Louisiana, in order to be able to map the newly acquired territory and add it to the existing American maps, and also to find a route towards the Pacific Ocean, without crossing through Spanish territory. It was an expedition that was led by these two army commanders under the order of Jefferson, and it was composed also of army volunteers.
