What changes made roman empire rich and prosperous?

Augustus claimed he gave over his power to the Senate which marked the end of the Roman Republic and the beginning of the Roman Empire. When Rome became an empire it already controlled most the Mediterranean World but later other Roman leaders continued to expand the empire a bit by bit. By the early AD 100s the Romans had taken over most of central Europe and all of Gaul. The Roman conquests promoted trade. People in Italy needed raw materials and with that they got other precious goods. To pay for these goods the Romans made a form of money or currency and their coins were accepted most everywhere. Stable Government and a well-run army helped Roma grow wealthy in safety. This peaceful period is called the Pax Romana, or Roman Peace. During this time Rome's population increased making trade grow. As a result the living standard improved. Also the Romans created many great accomplishments.