Smithsonian Institution
Smithsonian Learning Lab: The Expansion of the United States, 1846 48
This online lesson plan shows students through primary sources how the borders of the U.S. changed in just a few years. They are asked to analyze maps and use map skills. All maps and worksheets are included as well as additional resources.
University of Oregon
Mapping History Project: Mexican Cession: Political Boundaries
Click on this map to see the boundaries of Mexico, Texas, and the United States before the Mexican Cession, and then click again to see the land ceded to the U.S. after the Treaty of Guadalupe Hidalgo. Be sure to click to see the key...