U.S. History is designed for a two-semester American history sequence. It is traditional in coverage, following a roughly chronological outline, and using a balanced approach that includes political, economic, social, and cultural developments. At the same time, the book includes a number of innovative and interactive features designed to enhance student learning. Instructors can also customize the book, adapting it to the approach that works best in their classroom.

This tutorial will teach you how to graph the union of two inequalities using a number line. [2:06]

The critically acclaimed PBS series, "The West," provides the text of the actual Pacific Railway Act, designed to aid in the construction of a Railroad and Telegraph Line from the Missouri River to the Pacific Ocean.