The United States Postal Service is a wondrous American creation. Seven days a week, its army of 300,000 letter carriers delivers 513 million pieces of mail, forty percent of the world's volume. It is far more efficient than any other mail service--more than twice as efficient as the Japanese and easily outpacing the Germans and British. And the USPS has a storied history. Founded by Benjamin Franklin, it was the information network that bound far-flung...