Henry J. Sage
Sage American History: Expansion and War: The United States 1840 1860
Article on the era of westward expansion and the resulting Mexican American War. The author demonstrates how Manifest Destiny and frontier settlement led to the annexation of Texas and ultimately war with Mexico over the territory.
University of Groningen
American History: Outlines: Westward
Overview of U.S. westward expansion during the 1800s.
Library of Congress
Loc: America's Story: Arizona Became a New Territory
This 2-page article provides information about how Arizona became a new territory on February 24, 1863, and the corresponding silver and gold rush that encompassed the area.
Library of Congress
Loc: Exploring With Lewis & Clark
This site from Library of Congress provides a multimedia site using historical documents to tell the story of the Lewis and Clark Expedition. The movies require high speed access but the site will hold student interest.
Other
Conner Prairie: Road Through the Wilderness: The Making of the National Road
Information on the building of the National Road and its historical significance.
Oklahoma State University
Encyclopedia of Oklahoma History and Culture: Oklahoma Territory
A description of the Oklahoma Territory and its rapid growth in the late 19th century.