They would find one of our most important big-gun factories at Troy, New York, and another at Bethlehem, Pennsylvania, where also much of our armor-plate is made. The big Cramp Shipbuilding Works would be found at Philadelphia. They would find at Groton, Connecticut, the factory where all the interior parts of the Holland submarine boats are made, and at Fore River, Massachusetts, the big shipyard where the Holland submarine and other war vessels are constructed. [Illustration: The Heart of America] They would find the Lake Submarine Torpedo Boat Works at Bridgeport, the United States Naval Torpedo Station at Newport, Rhode Island, and one of our biggest navy yards, together with the E. W. Bliss Torpedo Works, in Brooklyn. The New York Arsenal they would find unprotected on Governor's Island. They would find the great duPont Smokeless Powder Works at Carney's Point, Parlin and Pompton Lakes, New Jersey, and at various points in New Jersey the largest and most important high-explosives works in the world. Take a map of the United States, and a pair of compasses, and with one point placed on the Hudson River, at Peekskill, New York, draw a circle having a radius of a hundred-and-sixty miles. There will be included within that circle all of the above-mentioned ammunition and armament works, which constitute nearly all the smokeless powder works, cartridge works, torpedo-boat works, small-arms works, and big-gun and armor-plate works in the United States. Also, this circle will include not only New York and nearby cities, but also Boston, Albany, Syracuse, Philadelphia, and the most important coal fields of Pennsylvania. The conquest of this area would not be a work of months, or of years, but only of a few days, and the thing would be done before we had time to mobilize the available fighting forces we have, much less to enlist and train and arm a citizen soldiery. This vital area is the solar plexus of Uncle Sam, and an army of a hundred thousand trained men, landed on our Atlantic seaboard, would be able to capture this entire area and subdue the populace as easily as the police force of New York can subdue a rioting mob. While we were arming and training our million men to make the Carnegie swoop, the army of invaders would be very busy. They would commandeer all our above-mentioned factories, and proceed to operate them with skilled American labor, which they would also commandeer and force to work, just as the Germans have forced the Belgians to work for them, and Mr. Carnegie's army of citizen soldiers would find themselves without means either of arming themselves or of supplying themselves with ammunition or of getting the skilled labor necessary to do the work.