Sector Border Berlin 1958. The photo shows the sector border in Berlin in 1958, a visible dividing line between East and West Berlin during the Cold War. The historical background of the image is the Berlin Ultimatum of 1958, with which the Soviet Union intensified the situation, making the border increasingly a political hotspot. The photo documents the division of Berlin before the construction of the Wall (1961) and shows the growing tensions between East and West in the Cold War.