具体描述
The United States has been shaped by the people and events of its past. This series vividly describes events that had a major impact on U.S. history and introduces young readers to the people who shaped them. The easy-to-read text, historic art and photography, suggested activities, and clear, simple maps help bring to life the cause of these events, their effects on people at the time, and their significance today. This book tells the story of the railroad and shows how the technical challenges and huge scale of the task were overcome by the hard labor of thousands of workers.
