Smithsonian Institution
Smithsonian Learning Lab: The Expansion of the United States, 1846 48
This online lesson plan shows young scholars 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...
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...
University of Oregon
University of Oregon: Mapping History: Compromise of 1850: Status of Slavery
An interactive map that clearly shows the change in the status of slavery in territories from the Missouri Compromise to the Compromise of 1850. Click on the map to see the status before and after the Compromise of 1850.