In 1831 Victor Hugo had written that he already heard 'the full sound of revolution, still deep down in the earth, pushing out under the kingdom in E… - Eric Hobsbawm

Most observers in the 1870s would have been far more impressed by its linearity. In material terms, in terms of knowledge and the capacity to transform nature it seemed so patent that change meant advance that history – at all events modern history – seemed to equal progress. Progress was measured by the ever rising curve of whatever could be measured, or what men chose to measure. Continuous improvement, even of those things which clearly still required it, was guaranteed by historical experience. It seemed hardly credible that little more than three centuries ago intelligent Europeans had regarded the agriculture, military techniques and even the medicine of the ancient Romans as the model for their own, that a bare two centuries ago there could be a serious debate about whether the moderns could ever surpass the achievement of the ancients, and that at the end of the eighteenth century experts could have doubted whether the population of Britain was increasing.

A world economy whose pace was set by its developed or developing capitalist core was extremely likely to turn into a world in which the ‘advanced’ dominated the ‘backward’; in short into a world of empire. But, paradoxically, the era from 1875 to 1914 may be called the Age of Empire not only because it developed a new kind of imperialism, but also for a much more old-fashioned reason. It was probably the period of modern world history in which the number of rulers officially calling themselves, or regarded by western diplomats as deserving the title of, ‘emperors’ was at its maximum.

When we write the ‘world history’ of earlier periods, we are in fact making an addition of the histories of the various parts of the globe, but which, in so far as they had knowledge of one another, had only marginal and superficial contacts, unless the inhabitants of some region had conquered or colonized another, as the west Europeans did the Americas.