The Kansas-Nebraska Act of 1854 may have been the single most significant event leading to the Civil War. By the early 1850s settlers and entrepreneurs wanted to move into the area now known as Nebraska. However, until the area was organized as a territory, settlers would not move there because they could not legally hold a claim on the land. The southern states' representatives in Congress were in no hurry to permit a Nebraska territory because the land lay north of the 36°30' parallel — where slavery had been outlawed by the Missouri Compromise of 1820. Just when things between the north and south were in an uneasy balance, Kansas and Nebraska opened fresh wounds.

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.