Answer: The Berlin Wall was actually built in 1961, not 1949. It was constructed by the German Democratic Republic (East Germany) to prevent mass migration from East Berlin (controlled by the Soviet Union) to West Berlin (controlled by the Western Allies).
As for the question of agreement, I agree that the Berlin Wall was built to prevent mass migration, but I would like to provide some additional context to support this agreement.
The construction of the Berlin Wall was a response to the increasing number of people leaving East Germany in search of better opportunities and freedom in West Germany. Prior to the wall's construction, around 2.7 million East Germans had fled to the West since the end of World War II. This mass migration created a brain drain and significant economic challenges for the East German government.
The Berlin Wall was intended to halt this exodus by physically dividing the city of Berlin and making it extremely difficult for East Germans to cross into West Berlin. The wall consisted of concrete barriers, guard towers, barbed wire, and other fortifications, effectively cutting off East Berlin from West Berlin. Guards were instructed to shoot anyone attempting to cross the wall without authorization, resulting in numerous tragic deaths.
By constructing the Berlin Wall, the East German government aimed to prevent mass migration and maintain control over its population. The wall became a potent symbol of the Cold War division between East and West, and its presence reinforced the ideological and political differences between the two sides.
Overall, the primary purpose of the Berlin Wall was indeed to prevent mass migration. It served as a physical barrier to deter people from leaving East Germany and seeking a better life in the West, and its construction had significant political and socio-economic implications for the region.