Within three centuries Rome had expanded from its position as a minor state in Italy to the effective control of those portions of three continents which bordered the Mediterranean. Conquests during the following century further extended the Roman frontiers. Under the Caesars Rome was a society in the throes of political transition. Roman Emperors, backed and frequently selected by the military, were exercising despotic power. They still paid lip service to the Constitution, an instrument that had relevance during the life of the defunct Republic. In the era of the Caesars the law slumbered and might ruled. The turbulent masses were fed and housed by the Roman Oligarchy to which the Emperors were ultimately responsible. The far flung territories conquered by military power and held by military occupation were subject to the authority of the same Roman Oligarchy. Behind the shams, frauds and tyrannies of a political dictatorship paying lip service to the corpse of a defunct Republic lay the stark realities of a bankrupt economy. Throughout the era of the Caesars the Roman Empire continued to expand geographically. It also came into contact and conflict with peoples so remote from Italy that for them Rome was only a name for tyranny, extortion and exploitation. Julius Caesar and his immediate successors penetrated these remote territories, subjugating them, levying tribute, appointing governors and other officials, policing them, pretending to rule over them. To do this soldiers were marching on foot into regions that lay thousands of miles from the mother city. To be sure, they marched over Roman roads and bridges so well constructed that some of them are still being used at the present day. But the excellence of Roman engineering could not match up to the implacable limitations of time and distance. Nor could they overlook the need for building the physical structure of Roman economy as they advanced into enemy territory. Equally decisive were the political consequences of the property confiscation and forced labor required to establish and maintain Roman power and enrich greedy Roman officials and their lackeys and overseers. Rising overhead costs, with no corresponding growth of income, an empty treasury in Rome, and a persistent policy of fleecing the provinces to pay for the normal costs of bureaucracy, plus its extravagances and excesses, could lead to only one possible outcome. Higher taxes and more ruinous levies in the newly conquered provinces could not fill the insatiable maw of deficit spending.