What year did the United States acquire the Rocky Mountain region through the Louisiana Purchase?
Note
The United States acquired a significant portion of the Rocky Mountain region as part of the Louisiana Purchase in 1803.
The Louisiana Purchase, a landmark land acquisition, occurred in 1803 when the United States purchased a vast territory from France. This purchase doubled the size of the U.S. and included a substantial portion of the Rocky Mountain region. This acquisition played a crucial role in westward expansion and opened up the Rockies to American exploration, settlement, and resource extraction.