The opening up of a new frontier is world-wide in its operations. Minnesota entered the Union as a State in 1858. The putting to practical use the Falls of St. Anthony was felt all over Europe. Thousands of little country mills, nestling amid the trees, and adding to the beauty of the English pastoral scenery, to-day stand idle, the great wheels covered with green moss; and Tennyson's "Miller" becomes a reminiscence. Iowa became a State in 1846, and now leads the world in the production of corn; and although it is a thousand miles from the seaboard, yet through its immense production, and with the cheapening of transportation, we find over seventy thousand Italians emmigrating to this country, as, in spite of low wages, they cannot compete on the plains of Lombardy. (See Wells's "Economic Changes.")--We find that the man at the front can ship from Chicago to Liverpool the product of five acres of grain for less money than the cost of manuring one acre of land in England. (_Ibid._) Every time a new frontier in America is opened, it means both prosperity and disaster. So large are the opportunities, so rich the results, that at first all calculations are upset. Natural gas in the Middle States changes the price of coal in Europe. The finding of a tin-mine is felt in Cornwall and Wales the next day. The opening of the iron-mines in Michigan makes Cornish towns spring up in the upper peninsula, while the finding of ore in desolate places has caused communities to spring up with all the conditions of a cosmopolitan civilization, and we have to-day men living twenty-five miles from trees or grass. But such is the energy of the frontier type, that grass-plats have been carried and planted on the solid rocks, as in Duluth, where hundreds of thousands of dollars are expended in the grading of streets, and the opening of the sewers, all having to be blasted to do the work. North Dakota was a wilderness of 150,000 square miles, and had not produced a single bushel of wheat for sale, in 1881. In 1886 it produced nearly 35,000,000 bushels; in 1887, 62,553,000. (See Wells's "Recent Economic Changes.") The opening up of these immense territories starts railways from California to Siberia; for, with the Great West competing, Russia is stirred to greater effort. India, with her great commerce with Great Britain, needs a shorter route; and the Suez canal is made. Australia must compete with the Western plains; and great steamers, filled with refrigerators, are constructed for carrying fresh beef. The South American republics respond in return.