In August 1961, the Berlin Wall was erected:__________.
a. to separate Berlin from East Germany--a decision mutually agreed upon by the United States and the Soviet Union. b. by the United States so that East Germans could not enter West Berlin.
c. by the Soviet Union to stem a growing tide of emigrants fleeing from East to West Berlin.
d. by the United States in order to keep illegal immigrants from entering West Berlin and subsequently claiming freedom in western Europe.