: A true exploration of world history, this book links chronology, themes, and geography in eight units, or parts of study, each emphasizes a single themeorigins, cities, empires, religion, trade, migrations, revolutions, and technology. : As in the first two editions, this book focuses throughout on three major questionsWhat do we know? How do we know it? What difference does it make?but the organization has changed, giving each feature a clearer place. Rich in primary sourcesboth written and visualand in data and interpretation, it addresses how historians form, debate, and revise our historical understanding of the world, shows the value of other disciplines in understanding history, and helps readers begin to assess their own place in the ongoing history of the world. MARKET: A great resource for the professional historian.