We have not inherited an easy world. If developments like the Industrial revolution, which began in England, and the gifts of science and technology have made life much easier for us, they have also made it more dangerous. There are threats now to our freedom, indeed to our very existence, that other generations could never even have imagined. There is first the threat of global war. No president, no Congress, no prime minister, no parliament can spend a day entirely free of this threat. If history teaches anything, it teaches self-delusion in the face of unpleasant facts is folly.