Sector border Berlin 1958; Photo; Licensed article; Original: 2880×2160; Photographer: Unknown; Licensable; Rights: © Bleek/zb Media. 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 picture is the Berlin Ultimatum of 1958, where the Soviet Union escalated the situation, increasingly making the border a political flashpoint. The photo documents the division of Berlin before the construction of the Wall (1961) and shows the growing tensions between East and West during the Cold War.