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.

This Khan Academy resource provides a table of contents with notes for several sections of AP US History: Period 9: 1980-present.

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

Discusses the causes, events, and consequences of the Spanish-American War and how the United States acquired several territories in the aftermath. Includes questions for students at end.

Discusses the background to establishing the League of Nations, its role in facilitating peace negotiations, and why it ultimately failed to prevent World War II. Explains why the United States never joined it and how the United Nations...

Looks at the Treaty of Versailles, what its terms were, why America never ratified it or joined the League of Nations, why Germans grew to resent the burdens it imposed on them, and how this contributed to Hitler's rise to power....

Discusses the Indian reservation system, the impact it had on Native Americans, violent clashes between whites and Indians, and how it was destroyed by the Dawes Act of 1887 and resurrected in the 1930s. Includes questions for students...

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...

This Khan Academy resource provides information about the War of 1812, including the surround issues before and after the fighting of it.

This Khan Academy resource provides notes for American History. "Manifest Destiny" is explained on this resource, along with the implications associated with expansion of the North American continent.