Westward Expansion

Lewis and Clark Expedition

  • Mississippi River Facts is a page maintained by the National Parks Service and provides a lot of basic facts about the significance of this river.
  • Map of the United States Including Western Territories is a 1848 map that "accompanied President James K. Polk's annual message to Congress in December 1848. It represents Polk's conception as a Southern Democrat of how to divide up the new territory acquired through the Treaty of Guadalupe-Hidalgo. It became the starting point of debates in Congress over slavery and westward expansion."
  • The Treaty of Guadalupe Hidalgo, that brought an official end to the Mexican-American War (1846-1848), was signed on February 2, 1848, at Guadalupe Hidalgo, a city north of the capital where the Mexican government had fled with the advance of U.S. forces.