Keeping this work secret from the American public required the strictest of security measures, and a bit of luck. Roosevelt had agreed with Churchill at a conference in Quebec in August 1943 to share all atomic technology with the British, that the two nations would work together on the project, which Churchill code-named “tube alloys” in his top-secret correspondence with the president. And yet the work at Los Alamos, Oak Ridge, and Hanford remained mostly an American phenomenon.
