Paralleling the up-building forces that established Roman supremacy were counter-forces which undermined and eventually destroyed the Roman Empire and Roman civilization: 

1.  The growth of city life at the expense of rural existence.  At the outset of its life cycle, Rome was essentially rural.  At the end of the cycle Roman culture was turning its back upon ruralism and moving into a culture that was to be chiefly urban during an entire millennium.  In that millennium Rome, her associates and dependencies, experimented with a culture that was essentially urban, but encircled, dependent and eventually replaced by a culture that was essentially rural.

2.  During the millennium between 600 B.C. and 500 A.D. the Romans and their associates succeeded in bringing large parts of Europe, Asia and Africa under their control, but the control was so rigid and temporary that tribalism and local nationalisms broke loose from the fetters of central authority and coercive integration, shattering the structure of Roman civilization and its structural core—­the Roman Empire.  Instead of resulting in closer cooperation, the strategy and tactics of the Roman builders and organizers led to contradictions, bitter feuds, civil strife, independence movements which combined with expansionist diplomacy and periodic wars to discourage, frustrate and eventually to eliminate peace, order and planned progress.

2.  The spread of chattel slavery had a profound effect upon the texture of Roman life.  At the outset Roman family farms housed the bulk of the population.  During the cycle of Roman civilization unnumbered millions of captives were seized in the course of military operations and reduced to slavery.  By the end of the Roman cycle the work-load of agriculture, commerce, industry, mining, transport, and the domestic life of the well-to-do was carried by slaves.  Basically, therefore, the Roman world was divided first into Romans and non-Romans and second into masters and slaves, with a third category which consisted of an immense bureaucracy (including the military), a professional and technological group and a heavy burden of persistent parasitism.

4.  Growth of the abyss that separated wealth and the wealthy from mass poverty in the cities and the countryside.  The abyss was widened and deepened by the presence of slavery.  More extensive and more frequent foreign conquests added to the volume of slave labor in a market already glutted and reduced the price of slaves.  Against this super-abundant cheap slave labor, free labor could compete only by reducing its standard of living and thus deepening the abyss of poverty.  At the other end of the social arc, the rich were able to surround themselves with multitudes of slaves who provided the energy needed to carry on the complex life of Roman civilization.  As the Roman world expanded, the abyss widened, deepened and became all but impassable.  It was from