Wingless Eagle: U.S. Army Aviation through World War I

At the start of the twentieth century the United States led the world in advances in aviation, with the first successful engine-powered flights at Kitty Hawk, North Carolina, and Dayton, Ohio, beginning in 1903. Fifteen years later, however, American airmen flew European-designed aircraft because American planes were woefully inadequate for service on the Western Front. Why was the United States so poorly prepared to engage in aerial combat in World War I?