From its dim origins among Germanic speakers in the British Isles, the English tongue spread for over a millennium through commerce, cultural exchange, and military conquest to become the de facto language of our modern, globalized world. From the Shanghai stock exchange to the United Nations to Internet message boards, whenever people reach out to one another across culture and geography, they do so overwhelmingly in English. Yet the remarkable story of its rise to global dominance has been curiously neglected by historians.