Answer:
The shifting borders created new political and cultural boundaries.
Step-by-step explanation:
Eastern Europe turned into a buffer region for the USSR. In the course of the WW2, communism gained more ground and head the nations that were loyal to Moscow. This new sysyem of government relied majorly from the Soviet leader Stalin. This resulted in the evolving of an Iron curtain that created a political and cultural boundary that distinguished the capitalist and free market economies from state organized ones.
In the year 1949, East Europe had become a communist, with the exclusion of Yugoslavia.
The East came to an agreement with the Soviet Union in a bid to establish a new world which basics is on the premise of allowing socialism and communist rule to boost the economies and well-being of his people so as to recover from the negative aftermath of the war.
The frequent war between West and East was mostly at the borderlines, migration was prohibited in the countries painted red in the attached map.