Who explored America's new land after the Louisiana Purchase? What was the lasting impact of the September 11th attacks? Each title in Turning Points in U.S. History highlights a defining event or era in America's history, its key players, causes, and events, and its lasting effects on our nation. Historical photographs complement the text, while modern images reinforce the lasting impacts we see today. Compelling What Do You Think? sidebars encourage deeper inquiry, and a timeline in each book highlights key events and dates. Also includes a table of contents, infographic, glossary, index, and reading tips for teachers and caregivers.