what was the gradual delcine of the pax romana
World History Rise and Fall of the Roman Empire. Decline of the Roman Empire. After the Pax Romana, the Roman Empire started to decline. The reasons were political and economic, and they had problems with foreigners. After the guard killed Commudus, they sold power to the highest bidder.This led to chaos every time a leader died.fter the Pax Romana, the Roman Empire started to decline. The reasons were political and economic, and they had problems with foreigners. After the guard killed Commudus, they sold power to the highest bidder.