The study resource from Khan Academy provides an overview of Period 7: 1890-1945 in American History. The Age of Empire is discussed in this lesson. This resource is designed as a review for the AP US History Test.

The study resource from Khan Academy provides an overview of Period 6: 1865-1898 in American History. Laissez-faire during the Gilded Age is discussed in this lesson. This resource is designed as a review for the AP US History Test.

This practice exercise from Khan Academy covers Period 7: 1890-1945 in American History. The imperialism debates are reviewed in this resource. This resource is designed as a review for the AP US History Test.

AP U.S. History unit on post-World War II and the Cold War. Comprehensive multi-media lessons, activities and assessment.

After the Civil War, westward expansion continued to increase, as migrants moved to the west in search of economic opportunities. In this video, Kim discusses the social and cultural effects of increased migration to the west, including...