Which action by Caesar Augustus gave the romans control over certain trade routes

The action through peace and stable rule by Caesar Augustus gave the Romans control over certain trade routes.

Explanation:

During the period of Roman republic incense from Arabia, ivory from East Africa, pepper from India, perhaps silk from China through Eastern merchants to Roman Markets. The trade remained smaller due to unpleasant conditions in East Mediterranean and wealth of Rome possessed in small financiers hand.

Through Augustus's peace and stable rule total Mediterranean established. For the first time lands from Spain to Syria made available for economic unity. The wealth till then wasted in wars was used for more peaceful purposes and necessities made easily available. The mistake Romans did was instead of spending wealth for home industries they spent on importing them.

Alexandria and Antioch recently came under Roman's control. The advantage by Augustus through Oriental Commerce was increase in taxable growth and booming trade. The routes followed by Eastern commerce were divided into two groups.

i.) Based on Red sea and its hinterland, carrying the trade of Arabia, East Africa, India.

ii.) Overland routes into Parthia and central Asia for carrying Chinese silk and some Indian trade.