After years of decline, all the talk about a "service economy" and predictions that it might never return, manufacturing is making a comeback in the United States. The Obama Administration is making the most of it, planning a forum tomorrow on what it calls "Insourcing of American Jobs" by companies returning from foreign shores. But will the jobs of the future bring back the Middle Class that made the US a superpower in the half-century after World War II? What industries are on the upswing? What kind of training will they require? What role should — or should not — be played by the federal government?