Starting from the ocean and from the forgotten histories of ocean-facing communities, this is a new history of the making of our world. After revolutions in America and France, a wave of tumult coursed the globe from 1790 to 1850. It was a moment of unprecedented change and violence especially for indigenous peoples. By 1850 vibrant public debate between colonised communities had exploded in port cities. Yet in the midst of all of this, Britain struck out by sea and established its supremacy over the Indian and Pacific Oceans, overtaking the French and Dutch as well as other rivals. This is a compulsive story full of cultural depth and range, a world history that speaks to urgent concerns today. The book weaves a bracingly fresh account of the origins of the British empire.