why urban centres were called the true bedrock of roman empires

  
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Please find below the solution to your query
1.  The great urban centres that lined the shores of the Mediterranean (Carthage, Alexandria, Antioch were the biggest among them) were the true bedrock of the imperial system.
 
2.  It was through the cities that ‘government’ was able to tax the provincial country sides which generated much of the wealth of the empire.
 
3.  This means that the local upper classes actively collaborated with the Roman state in administering their own territories and raising taxes from them.
 
4.  In fact, one of the most interesting aspects of Roman political history is the dramatic shift in power between Italy and the provinces.
 
5.  Throughout the second and third centuries, it was the provincial upper classes who supplied most of the cadre that governed the provinces and commanded the armies
 
 
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