U.S. History | World War I | Grades 8–12The Zimmermann Telegram — WWI PowerPoint Lesson──────────────────────────────────────────────────── Teach one of history's most dramatic intelligence coups with this complete, no-prep lesson on the Zimmermann Telegram. This grades 8–12 PowerPoint lesson unpacks the secret German message that helped pull the United States into World War I — using the decoded telegram itself as a primary source document. WHAT IS INCLUDED — 4 FILES (PPTX + TEACHER EDITION PDF