lMilitary virtues became supreme as the state religion, and the desire for more tribute and captives for sacrifice, drove the Aztecs to further conquests.
lThe empire was not integrated; defeated local rulers often remained in place as subordinate officials.
lThey were left alone if tribute and labor obligations were met.
lRevolts against the exactions were ruthlessly suppressed.
lThe Aztec system was successful because it aimed at political domination and not direct control.
lIn the long run the growing social stresses created by the rise of the pipiltin and the terror and tribute imposed on subjects contributed to the empire's collapse.