A Japanese war map, a collection of U.S. military uniforms, and a gas mask are all part of the story of Japan's surprise attack on Pearl Harbor on December 7, 1941. By examining artifacts and primary sources like these, readers are drawn into the event that brought the United States into World War II. Part of the Time Capsule History series, this book examines artifacts of the Pearl Harbor attack and its aftermath. Open this imaginary time capsule and learn!