Part II discusses the Eurasian cultural balance to 1500 AD, including the expansion of Hellenism, the closure of the Eurasian ecumene, the development of major religions, the barbarian onslaught, resurgence of the Middle East, and steppe conquerors. McNeill proposes that the basic engine of world history during this period is the temporary primacy of different regions of the ecumene, with a rough parity reestablished as innovations spread to other centers of civilization. The sequence is Hellenistic / Indian / Islamic / Chinese and Mongol. Generally the eras are structured in terms of the internal history of the dominant region, followed by the history of the rest of the world with a focus on how they reacted to the diffusing techniques and ideas of the dominant region.