v. 1. The ancient world : prehistoric eras to 600 C.E. -- v. 2. The expanding world : 600 C.E. to 1450 -- v. 3. The first global age : 1450 to 1750 -- v. 4. Age of revolution and empire : 1750 to 1900 -- v. 5. Crisis and achievement : 1900 to 1950 -- v. 6. The contemporary world : 1950 to the present -- v. 7. Primary documents ; master index