"Louisiana Purchase." YourDictionary, n.d. Web. 12 October 2018. <http://www.yourdictionary.com/louisiana-purchase>.
Louisiana Purchase. (n.d.). Retrieved October 12th, 2018, from http://www.yourdictionary.com/louisiana-purchase
A former territory of the western United States extending from the Mississippi River to the Rocky Mountains. It was purchased from France on April 30, 1803, for $15 million and officially explored by the Lewis and Clark expedition (1804-1806).