1803: The Louisiana Purchase extends the western boundary of the United States to the Rocky Mountains, occupying the drainage area of the Mississippi River, as estimated… by the French explorer Robert La Salle. The Purchase doubled the territory of the United States http://geography.about.com/od/politicalgeography/a/usboundary.htm.<span>What body of water and what landform are the eastern and ...</span><span>www.answers.com/Q/What_body_of_water_and_what_landform_are_the_eastern_and_western_boun… go and read this it will help and only take a second</span>
