A true exploration of world history, The World's History links chronology, themes, and geography in eight units, or parts of study, each emphasizing a single theme–origins, cities, empires, religion, trade, migrations, revolutions, and technology. Geographically, each part covers the entire globe, though specific topics place greater emphasis on specific regions. Rich in primary sources–both written and visual–and in data and interpretation, the new edition addresses how historians form, debate, and revise our historical understanding of the world, shows the value of other disciplines in understanding history, and helps students begin to assess their own place in the ongoing history of the world.