Pax Romana which is Latin for "Roman Peace" was a time, as the name suggests, a long period of peace and minimal military expansion from 27 BC to about 180 AD. Pax Romana was succesful because all of the land surrounding the Mediterranean was at peace because everyone was under Roman Law.
Explanation:
The 200 years of the Pax Romana saw many advances and accomplishments, particularly in engineering and the arts. To help maintain their sprawling empire, the Romans built an extensive system of roads. These durable road facilitated the movement of troops and communication.
Stalins rule over the people was a first reason, second ww2 destroyed many of eastern europe. The harsh life in eastern europe would end when stalin dies which is 1953. He imposed many laws on reconstruction which oppressed the powerless people of eastern europe.