A small island in the North Atlantic, colonized by Rome, then pillaged for hundreds of years by marauding neighbours, becomes the dominant world power in the 19th century. As its power spreads, its language follows. Then, across the Atlantic, a colony of that tiny island grows into the military and cultural colossus of the 20th century. These centuries of empire-building and war, international trade and industrial ingenuity will bring to the world great works of literature and extraordinary movies, cricket pitches and episodes of Dallas, the printing press and the internet. But what happens next is quite unprecedented. While the global dominance of Anglo-American power appears to be on the wane, the English language has acquired an astonishing new life of its own. With a supra-national momentum, it is now able to zoom across time and space at previously unimaginable speeds. In Robert McCrum's analysis, the cultural revolution of our times is the emergence of English, a global...