This is a great book that deserves to be read despite its length. If you pay attention, the period of analysis is practically the same Paul Johnson took into account when he wrote the well-known masterpiece "Modern times". Of course, this book is a masterpiece as well: it tells the history of the XX century from a left-wing point of view which contrasts with the one supported by Johnson. Therefore, Hobsbawm will be nicer when talking about Gandhi or Keynesian economics, but will display a lot of criticism when discussing Margaret Thatcher and Ronald Reagan, for instance. Anyway, the book focuses on some interesting aspects that Johnson didn't consider. For example, Hobsbawm depicts the development of artistic schools and trends throughout the century. He also, stops in the sixties in order to tell the rise of youth movements, and pays more attention to the causes that determined the collapse of the URSS. Now, this last subject is developed outstandingly: Hobsbawm says that USSR signed its act of defunction when its leadership rejected to launch an economic reform that was necessary to bring technological innovation-led growth and thus decided to keep an economic model that guaranteed full employment but meant stagnation in the end. Another highlight in Hobsbawm book appears when he discuss the rise and fall of the Third Reich. Here Hobsbawm reaches his most powerful conclusion: That the Nazism was the worst threat the Western culture and civilization ever had. In that sense, right-wing people and leaders in the western world were wrong when they thought that USSR was THE "devil". Why? Because, says Hobsbawm, nazism was not only an ideology not based on XVIII century's enlightment tradition (one that was shared by both liberalism and socialism), but also nazi politics was not directed on a normal basis of material and strategic interests (which are predictable somehow) but it was based on the irrationality of a milenaristic plan. On the other hand, Hobsbawm's book shows a few wrong assesments which I think are linked to some of his left-wing perspectives that look weak. For example, he is worried about the new technologies that reduce the labor force required in some industries. This is an observation shared by progressists like Eduardo Galeano, for instance. But, of course it is easy to demonstrate that it is wrong (otherwise Japan and U.S. should have incredible high rates of unemployment! ). Finally, Hobsbawm's book ends providing us with a very important lesson for the future which is that most of the movements and ideologies that have been developed during the last decades (sects, nationalism, fundamentalism, etc.)as a response to the world's economic, social and moral crisis are not only useless to face this multiple crisis but are potentially harmful to humanity. In the end, this is a strong call to our attention because it says that we are starting the XXI century bringing the XX century's problems with us and without having found the solutions for them yet.