To keep the people in their country.
The Soviet Union didn't build the Berlin Wall. The Soviets merely told East German dictator Walter Ulbricht to stop the flow of defections from East to West or he would. East German Army engineer units built the Wall.
It was build in East Berlin, by the East German government (presumably at the behest of the Soviet Union), on the East Geman side of the border between East and West Berlin. Its purpose was to prevent the escape of East German citizens to West Berlin.
The Soviet Union built the Berlin Wall to block their section (East Berlin) from the US/French/Britishcontrolled sections in West Berlin.It appears that the German Communist Walter Ulbricht, concerned that Germans were escaping from West Germany convinced the Russians to build the wall. The construction of the wall was supervised by the East German (communist) leaderErich Hoeneker.
Because the Berlin Wall was built by the east German communist rulers to prevent east German people from escaping to the capitalist west.
a wall
a wall
a wall
a wall
built the Berlin Wall (:A+
...keep the East Germans out of West Berlin.
Because they could no longer see their friends in the same city
The East German Army Engineering Command built the Berlin Wall, and also the fortifications along the inter-German border.