Chicago historian William H. McNeill wrote "The Rise of the West" (1965) to show how the separate civilizations of Eurasia interacted from the very beginning of their history, borrowing critical skills from one another, and thus precipitating still further change as adjustment between traditional old and borrowed new knowledge and practice became necessary. He then discusses the dramatic effect of Western civilization on others in the past 500 years of history. McNeill took a broad approach organized around the interactions of peoples across the globe. Such interactions have become both more numerous and more continual and substantial in recent times. Before about 1500, the network of communication between cultures was that of Eurasia. The term for these areas of interaction differ from one world historian to another and include "world-system" and "ecumene." His emphasis on cultural fusions influenced historical theory significantly.