The United States, however, has an even more urgent situation as to frontier in its Atlantic and Pacific coasts. If my claim is correct, in the instance of France, that a water frontier is continuous when passage from end to end by water is practicable, this is also continuous; and the battle fleet has demonstrated the fact within the past few years. The United States, then, has a maritime frontier line from Eastport, Maine, to Puget Sound; and, like other military lines, it divides into three principal parts immediately obvious,—the Atlantic Coast, the Pacific Coast, and the line between. This summary will not be any more true, nor any more useful for reflection, when the line passes by Panama instead of the Straits of Magellan; but it certainly will be more obvious. It then will be seen easily, as now may be seen certainly, that the important part of the long line in the present case, as in the future, is the center, because that insures or prevents passage in force from side to side; the transfer of force; in short, the communications. This reproduces again the Danube position, and also the chain of Spanish positions from Genoa to Belgium. It is once more the central position, which we have met before in such varying localities and periods; but the central position of Panama has over that now open to us, by Magellan, the advantage of interior lines, of which class of lines indeed the contrast between the existing and the future of routes offers a notable illustration. 6. STRATEGIC POSITIONS[24] The strategic value of any place depends upon three principal conditions: 1. Its position, or more exactly its situation. A place may have great strength, but be so situated with regard to the strategic lines as not to be worth occupying. 2. Its military strength, offensive and defensive. A place may be well situated and have large resources and yet possess little strategic value, because weak. It may, on the other hand, while not naturally strong, be given artificial strength for defense. The word “fortify” means simply to make strong. 3. The resources, of the place itself and of the surrounding country.... Where all three conditions, situation, intrinsic strength, and abundant resources, are found in the same place, it becomes of great consequence strategically and may be of the very first importance, though not always. For it must be remarked that there are other considerations, lesser in the purely military point of view, which enhance the consequence of a seaport even strategically; such as its being a great mart of trade, a blow to which would cripple the prosperity of the country; or the capital, the fall of which has a political effect additional to its importance otherwise. I. _Situation_