The greatest obstacle to discovering the shape of the earth, the continents, and the oceans was not ignorance but the illusion of knowledge. - Daniel J. Boorstin

The century after the Civil War was to be an Age of Revolution — of countless, little-noticed revolutions, which occurred not in the halls of legislatures or on battlefields or on the barricades but in homes and farms and factories and schools and stores, across the landscape and in the air — so little noticed because they came so swiftly, because they touched Americans everywhere and every day. Not merely the continent but human experience itself, the very meaning of community, of time and space, of present and future, was being revised again and again, a new democratic world was being invented and was being discovered by Americans wherever they lived.

The American settlers came to take and shape the land. The first occupants of the land — the "Indians" whom the European migrants encountered — would not be treated, in the pattern of the Romans, as people to be incorporated into an empire. Instead, they were treated as part of the landscape. Most of them were simply cleared away, like the forest, or pushed back, like the wilderness.

While words take time to utter and hear, and require attention to parse their meaning, the impact of the image is instantaneous, its influence decadent. Before the primacy of the image, a salesman or an advertisement would have to describe the attributes of a product in a rational appeal to the intellect. Afterward, it was the mythology of the brand, usually concocted by psychologists, that would sway a consumer’s heart. Likewise, with the rise of the image in politics, the policy platform of a presidential candidate would come to matter less than the ability of his image to convey ineffable or irrelevant values.