A map from 1911 showing the political boundaries of Argentina, Chile, Paraguay, and Uruguay at the time. Bordering portions of Brazil and Bolivia are also shown. State boundaries are shown in red, and the map includes capitals, major...

A map of the Louisiana territory purchased from France in 1803, and the boundary established with the western Spanish territory by the purchase. The map overlays the current State boundaries to show the extent of the territory.

A map of the Louisiana territory purchased from France in 1803, and the boundary established with the western Spanish territory by the purchase. The map overlays the current State boundaries to show the extent of the territory.

A map of eastern North America showing the land claims of the thirteen original states in 1783, from the Atlantic coast west to the Mississippi River. The map notes that New York claimed all the lands west of the Alleghany mountains....

A map of the Chesapeake Bay and Pamlico Sound region showing the early English settlements of Jamestown and the Falls (Richmond). The map shows rivers and coastal features, and the modern State boundaries of Pennsylvania, Delaware,...

A detailed map of the area around Chattanooga, Tennessee, showing the region during the Chattanooga Campaign of the American Civil War in October-November, 1863. The map shows the state boundaries of Tennessee, Alabama, and Georgia,...

A map of the parts of Georgia, South Carolina, and North Carolina showing the area of Sherman's campaign in late 1864 to early 1865. The map shows the route of Sherman's March from Atlanta to Savannah, and his northward route from...

A map of the Western seat of war during the American Civil War, showing state boundaries and capitals, major cities, forts, battle sites, mountain systems, and rivers in the area.

A map of the Kentucky and Tennessee region showing the western area of operations around Perryville, Kentucky, during the American Civil War (1862). The map shows state boundaries, major cities and towns, forts, and rivers in the area....

A map of the early United States between 1783 and 1789 showing the territorial State claims west to the Mississippi River, and is keyed to show undefined or disputed boundaries, boundaries of States and territories, and boundaries not...

An overview of the Oregon Boundary Treaty of 1846, which set the boundary between British North America and the United States at the 49th parallel. Information on the treaty, the personalities involved, relevant images, and a map are...

A map of the United States in 1854 showing the results of the test-vote on the Kansas-Nebraska Bill in the House of Representatives, which would repeal the Missouri Compromise of 1820 and allow territorial settlers to determine if...

A map of the United States at the outbreak of the Civil War (1860-1861) showing the States that seceded to form the Confederate States of America. The map also shows the territorial boundaries of the Washington Territory, Dakota...

Use this site to learn about basic gas properties including motion, viscosity, and compressibility. Includes links to activities for all ages.

This resource consists of primary documents about the international eugenics movements in the late-19th and early-20th centuries. Its goal is to show how eugenics influenced immigration laws and how eugenics theories and policies...

The data concerning Afghanistan and Iran refer to the period prior to the Saur and Islamic revolutions, respectively. It is not known whether such communities still exist in these two countries. Each existing community is primarily...

Ancient Assyrians were inhabitants of one the world's earliest civilizations, Mesopotamia, which began to emerge around 3500 B . C . The Assyrians invented the world's first written language and the 360-degree circle, established...

The Arch of Hadrian was erected in honor of the Roman emperor Hadrian in the 2nd century A.D (and probably a little before 131/132 A.D. when we know Hadrian visited Athens). The arch was built over the line of an ancient road that led...

In 1787, America was having big problems. There was no single type of money, or currency, in the new nation. States were arguing over trade issues and local boundaries. Each state seemed to see itself as independent and self-governing...

A 2002 article by Dr. Peter Ashton of Science in Africa stating that war between countries over water rights is inevitable, especially in countries where the water supply is scarce. Since many such countries share water boundaries,...

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 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 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 and the Louisiana Territory showing boundary disputes and boundary claims between 1763 and 1809. The map shows the natural boundaries and extent of the original Louisiana Territory claimed by the French, the...