From a fledgling agrarian nation clinging to the Atlantic seaboard in 1800, the United States by 1900 was the world’s leading industrial nation, producing a third of the world’s industrial output. Through nearly 200 photographs and drawings, America Transformed: Engineering and Technology in the Nineteenth Century highlights not only the obvious icons of achievement such as the Brooklyn Bridge and Erie Canal but also the development of the nation’s industrial, manufacturing, and transportation infrastructure. Development and innovation in mining; textile, iron, and steel mills; water treatment, power, and irrigation systems; and canals, railroads, and bridges all transformed American life.