The America At War series is an excellent way to introduce young students , 5th grade and up, to the perils of war. This book delves into the causes and effects of World War II with amazing primary and secondary sources. The accompanying CD-ROM includes loads of interactive materials.The America At War series is an excellent way to introduce young students , 5th grade and up, to the perils of war. This book delves into the causes and effects of World War II with amazing primary and secondary sources. The accompanying CD-ROM includes loads of interactive materials.