East Berlin was controlled by the Soviet Union and aiding them would have been considered an act of war, thus starting World War III
Berlin has never been a republic.
Berlin was 110 miles east of the "Inter German Border," the line that separated East Germany from West Germany.
The Berlin Wall was the important Cold War symbol that was destroyed in Germany in 1989. It was a physical barrier that separated East Berlin from West Berlin and symbolized the division between the democratic and communist worlds during the Cold War. Its demolition marked the reunification of East and West Germany and the end of the Cold War era.
Germany & Berlin
During the Cold War the German city of Berlin was split into separate cities. East Germany was a separate city and country. The Berlin Wall was built to divide the city.
The Berlin Wall was built by the German Democratic Republic during the Cold War to prevent its population from escaping Soviet-controlled East Berlin to West Berlin, which was controlled by the major Western Allies. It divided the city of Berlin into two physically and ideologically contrasting zones.
This was the most famous connecting point between East Berlin and West Berlin during the Cold war division of Germany into East Germany and West Germany, and Berlin into East Berlin and West Berlin. It was an opening in the Berlin Wall through which strictly limited travel was allowed. The USSR-dominated East German government prevented East Germans from crossing the Wall to the West, sometimes by shooting those who tried. West Berlin was an isolated enclave within the Eastern Zone until the Berlin Wall was torn down in 1989, leading to the 1990 reunification of Germany. Checkpoint Charlie was in the Friedrichstadt section of the city, and was the only crossing point authorized for Allied military forces.
Stalin cut off supplies going into East Germany and the whole Berlin airlift was to supply East Germany. From that point on the Cold War was the point of relationship between western powers and Russia.
The Berlin Wall was constructed in 1961 to stop people from fleeing the area. It was also an attempt to keep changing political views from taking root in East Germany.
If you are asking about the famous Berlin Wall which separated East and West Berlin during the Cold War era, that was not designed by an architect, it was a purely improvisational connection of various existing walls into one larger structure, organized by the East German secret police or "stazi".
The Berlin Wall separating Communist East Germany and Democratic West Germany.
Berlin was divided into east and west sectors. It was one of the crossings at the Berlin Wall from East to West Germany.