travel restrictions on would-be emigrants. In direct response, the US President publicly re-asserted the Western commitment to West Berlin—thereby implicitly conceding that the city’s eastern half was in the Soviet sphere of influence. The rate of exodus through Berlin grew faster than ever: 30,415 people left for the West in July; by the first week of August 1961 a further 21,828 had followed, half of them under twenty-five years of age. At this rate the German Democratic Republic would soon be empty. Khrushchev’s response was to cut the Gordian knot of Berlin. After the Allied foreign
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