On May 10, 1876, Ulysses S. Grant pulled a lever to start the mighty 1,400-horsepower Corliss Steam Engine, powering acres of machinery for the nation's Centennial Exhibition in Philadelphia. Grant summed up a century of American progress by saying, "Whilst proud of what we have done, we regret that we have not done more. Our achievements have been great enough however to make it easy for our people to acknowledge superior merit wheresoever found." That...