Toggle back and forth on this interactive map to see how the Kansas-Nebraska Act of 1854 completely negated the Missouri Compromise. Click on the map to see where slavery was permitted before 1854 and then after. Be sure to click on the...

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.

Interactive and animated maps and timelines of historical events and time periods in American history from pre-European times until post-World War II.

On this map you can see Alaska and Hawaii in relation to the contiguous United States and read brief text about their purchase/annexation, territorial status, and addition as states.

Click on the sliding bar and watch how the United States territory grew with the Louisiana Purchase, Florida Acquisitions, Texas Annexation, Oregon Country, and Mexican Cession.

After examining a map showing the expansion of the United States, click to read about each addition to the country and see where that addition is. Play Expansion Concentration to test your skills.

A map of the Oregon Territory between the time of exploration by George Vancouver (1792) and the Oregon Treaty of 1846. The map is color-coded to show the disputed claims of the British and United States, the Russian American line of...

A map of the Oregon Territory between the time of exploration by George Vancouver (1792) and the Oregon Treaty of 1846. The map is color-coded to show the disputed claims of the British and United States, the Russian American line of...

A map of the Oregon Territory showing the boundary on the 49th Parallel established by treaty between Great Britain and the United States in 1846, dividing what was once jointly held territory. The map also shows the boundary with Upper...

A map of the United States at the time of the Kansas-Nebraska Act (1854) which allowed settlers to determine whether or not slavery would be allowed in their territories. The map is color-coded to show the Free States (including...

A map of the western United States between 1836 and 1850 showing the Texas controversy and territorial adjustments at the time. The map is color-coded to show the unorganized territory of the Louisiana Purchase and the boundary line with...

A map of North America in 1840 at the time when the concept of "Manifest Destiny" was being applied to annex the Oregon Territory, Texas, and much of northern Mexico into the United States. The map is color-coded to show the extent of...

A map of the United States showing the effects of the Compromise of 1850. The map is keyed to show the free states and slave states, and notes California admitted to the Union as a free state; the Nebraska Territory as free by the...

A series of lessons utilizing primary texts, including narratives, photographs, and maps, through which students explore the following question: "What motivated thousands of people to journey west during the 1800s?"

This is a very simple map showing the Republic of Texas and the territory disputed with Mexico in 1836.

This online lesson plan shows learners 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.

A map of western North America between the opening of the Oregon Trail in 1832 to 1842, prior to the establishment of the Provisional Government of Oregon by American settlers in 1843. The map shows the boundary of the Oregon Country,...

A map of the western United States and northern Mexico showing the territorial disputes settled and boundary established by the Adams-Onis Treaty between the United States and Spain in 1819. The territorial disputes involved the natural...

A map of Mexico in 1845, prior to the ceding of the northern territories to the United States in 1846. The map shows the territories of Oregon, Texas, and Central America under Mexican control, and the frontiers of the Missouri and...

A map of the United States and territories in 1821 after the Missouri Compromise, showing the Free States and territories, the Slave States and territories, and the transitional territories at the time. The map is color-coded to show the...

A map of the Oregon Country showing the adjustments to the boundaries between 1818-1846, including the boundary established in 1818 to the east of the jointly controlled territory (Great Britain and the United States), the southern...

A map of the United States showing the growth of the nation from 1783-1867. The map is color-coded to show the thirteen original states, the territory acquired by conquest during the revolution and the Treaty of 1783, the Louisiana...

A map from 1911 of the United States showing the territorial acquisitions from the original states and territory established in 1783 to the Tripartite Convention of 1899 in which Germany and the United States divided the Samoan...

A map from 1872 of the United States used to illustrate the comparative area sizes of the states to other countries in the world. The map shows state and territory boundaries at the time (Dakota, Montana, Washington, Idaho, Wyoming,...