The document discusses the economic and social changes that occurred during the first "dark ages" in civilizations like Mesopotamia and Egypt. It summarizes Marx's view that struggles within ruling classes can lead to new ruling elites and exploited groups, or the mutual destruction of opposing classes. In ancient Egypt, power struggles and failures of the agricultural system contributed to the collapse of the Old Kingdom, but foreign invasions later allowed new means of production to emerge during the Middle Kingdom. The document also notes that major advances often occurred not within core civilizations but among peripheral "barbarian peoples."