The Holocaust was the deliberate extermination of Jews and other people deemed undesirable by Germany's Nazi party during World War II. This thoughtful book examines evidence from the early 1900s of racism, intolerance, and nationalism in Germany that historians believe led up to this genocide and ethnic cleansing. Readers will learn how prejudice and circumstances at the time of an event can influence people's interpretation of evidence and how that perspective can change over time. They will also learn how to use critical thinking in their own examinations of evidence. Present-day examples show how history repeats itself when evidence is denied or interpreted to one side's benefit. Teacher's guide available.