Two Shocks of 1949

CHAPTER 3 · 1949 · The Cold War, 1945–1991

In one autumn the strategic arithmetic of 1945 collapses. On 29 August, at Semipalatinsk in the Kazakh steppe, the USSR detonates “First Lightning” — a near-copy of the Nagasaki bomb, delivered years ahead of Western intelligence estimates by a crash program fed both by captured German scientists and by espionage: Klaus Fuchs had been mailing Los Alamos’ actual blueprints. The American monopoly, the silent guarantor of every Berlin-style bluff, is gone after four years.

The turn: Semipalatinsk, 29 August 1949.

This chapter is one scene of an interactive atlas: the map repaints as the dates advance, campaigns draw themselves, and every chapter argues its causes and consequences — then a field exam asks you to prove it on the map.