Learn how to interpret a phase diagram, explain Dalton's Law, and describe the state of equilibrium between a liquid and a gas, a liquid and a solid, and a gas and a solid. This resource contains in-depth explanations and multiple...

By the end of this section, you will be able to interpret a phase diagram; state Dalton's law; identify and describe the triple point of a gas from its phase diagram; and describe the state of equilibrium between a liquid and a gas, a...

A collection of maps of the state of New York, including links to city maps, historical city maps, and maps of National Parks, Monuments, and historical places.

A collection of maps of the state of Virginia. Includes historical and city maps, and maps of places such as Cumberland Gap, Glen Echo Park, and Great Falls Park.

A collection of maps of the state of New Hampshire, including a few maps of cities and important national monument and historical areas.

This is the government health site for the state of Texas. Includes birth and death certificates, health alerts, publications, and other important information for Texas citizens.

This informative site from the Texas State Library tells of the siege of Bexar and includes several documents, including Gen. Cos' surrender terms, to click on to enlarge. Transcriptions are provided.

The history of the labor movement in Texas is examined, beginning during the Republic of Texas. The article discusses the different labor organizations that formed in various industries, and how these evolved over time. As immigration...

Read about the part the question of the annexation of Texas played in the election of 1844 and the machinations of several politicians in addressing this question.

Discusses the major events and acquisitions in the westward expansion of the United States. Includes Louisiana Purchase, Florida Purchase, Oregon Territory, the Republic of Texas, Gadsden Purchase, etc.

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 detailed biography of John Henninger Reagan. He became the leader of the Texas Democratic Party as well as the postmaster general of the Confederacy.

By the end of this section, you will be able to state the ideal gas law in terms of molecules and in terms of moles; use the ideal gas law to calculate pressure change, temperature change, volume change, or the number of molecules or...

By the end of this section, you will be able to state Newton's third law of motion, explain the principle involved in propulsion of rockets and jet engines, derive an expression for the acceleration of the rocket , discuss the factors...

The opposition against Texas' annexation was strong, and supporters faced challenges between Polk's election and inauguration. What lead up to the passing of the Texas annexation? Check out primary texts to explore this time in Texas'...

Three early American artists captured the landscape of the unknown frontier which slowly became the state of Texas.

This timeline launch page gives a general timeline of Texas History, and contains links for more in-depth study of each time period. It spans from ancient history to the twentieth century.

Read this short overview of The Law of April 6, 1830 which was to counter concerns that Mexican Texas, part of the border state of Coahuila y Texas, was in danger of being annexed by the United States.

A description of the Cordova Rebellion in 1838 against the Republic of Texas, led by Vicente Cordova.

Read about the election of 1844 and the views of the two candidates, James Polk and Henry Clay.

Examines the circumstances surrounding Texas's entry into the Union in 1845 as a slave state. It was an uneasy union, with ongoing controversy around the issue of slavery. This lasted through the Mexican-American War and helped to...

Ghost Towns of Texas offers the rich history of the Old West highlighting the many ghost towns in Texas.

An in-depth study of the state of Texans' civic involvement and social connectedness, from 2013.

A tutorial reviewing the states of matter and the effects of heating and cooling matter in the different states. (Note: some of the links may not load in the archived version of the site.)