The splitting of the atom has changed everything save our modes of thinking and thus we drift toward unparalleled catastrophe. When the secret of the atom was unlocked in Western Europe in the late thirties, it was carried to Britain, the United States and Canada by scientists escaping from the tyranny of the Hitler regime. They shared a common fear that Hitler would gain the secret from scientists who remained in Western Europe and use it for destructive purposes. A group of these scientists prevailed upon Albert Einstein to write to President Roosevelt and draw this possibility to his attention. Einstein reluctantly did so in August, 1939.
War is inevitable.
It is for the President to decide what scientists should do about it. The Manhattan Project was the largest secret operation in history. It involved elements of the military, government, industry and academia. At its height it employed over 600,000 people. Part of its uranium supply came from Canada.