The Influence of Sea Power upon History. Alfred Thayer Mahan
frigates were sent to St. George's Channel, against the English communications. In the midst of a hostile people, the English army in Ireland was seriously imperiled, but was saved by the battle of the Boyne and the flight of James II. This movement against the enemy's communications was strictly strategic, and would be just as dangerous to England now as in 1690.
Spain, in the same century afforded an impressive lesson of the weakness caused by such separation when the parts are not knit together by a strong sea power. She then still retained, as remnants of her past greatness, the Netherlands (now Belgium), Sicily, and other Italian possessions, not to speak of her vast colonies in the New World. Yet so low had the Spanish sea power fallen, that a well-informed and sober-minded Hollander of the day could claim that "in Spain all the coast is navigated by a few Dutch ships and since the peace of 1648 their ships and seamen are so few that they have publicly begun to hire our ships to sail to the Indies, whereas they were formerly careful to exclude all foreigners from there … It is manifest," he goes on, "that the West Indies. being as the stomach to Spain (for from it nearly all the revenue is drawn), must be joined to the Spanish head by a sea force; and that Naples and the Netherlands, being like two arms, they cannot lay out their strength for Spain, nor receive anything thence but by shipping,--all which may easily be done by our shipping in peace, and by it obstructed in war." Half a century before, Sully, the great minister of Henry IV., had characterized Spain "as one of those States whose legs and arms are strong and powerful, but the heart infinitely weak and feeble." Since his day the Spanish navy had suffered not only disaster, but annihilation; not only humiliation, but degradation. The consequences briefly were that shipping was destroyed; manufactures perished with it. The government depended for its support, not upon a wide-spread healthy commerce and industry that could survive many a staggering blow, but upon a narrow stream of silver trickling through a few treasure-ships from America, easily and frequently intercepted by an enemy's cruisers. The loss of half a dozen galleons more than once paralyzed its movements for a year. While the war in the Netherlands lasted, the Dutch control of the sea forced Spain to send her troops by a long and costly journey overland instead of by sea; and the same cause reduced her to such straits for necessaries that, by a mutual arrangement which seems very odd to modern ideas, her wants were supplied by Dutch ships, which thus maintained the enemies of their country, but received in return specie which was welcome in the Amsterdam exchange. In America, the Spanish protected themselves as best they might behind masonry, unaided from home; while in the Mediterranean they escaped insult and injury mainly through the indifference of the Dutch, for the French and English had not yet begun to contend for mastery there. In the course of history the Netherlands, Naples, Sicily, Minorca, Havana, Manila, and Jamaica were wrenched away, at one time or another, from this empire without a shipping. In short, while Spain's maritime impotence may have been primarily a symptom of her general decay, it became a marked factor in precipitating her into the abyss from which she has not yet wholly emerged.
Except Alaska, the United States has no outlying possession,--no foot of ground inaccessible by land. Its contour is such as to present few points specially weak from their saliency, and all important parts of the frontiers can be readily attained,--cheaply by water, rapidly by rail. The weakest frontier, the Pacific, is far removed from the most dangerous of possible enemies. The internal resources are boundless as compared with present needs; we can live off ourselves indefinitely in "our little corner," to use the expression of a French officer to the author. Yet should that little corner be invaded by a new commercial route through the Isthmus, the United States in her turn may have the rude awakening of those who have abandoned their share in the common birthright of all people, the sea.
III. Extent of Territory. The last of the conditions affecting the development of a nation as a sea power, and touching the country itself as distinguished from the people who dwell there, is Extent of Territory. This may be dismissed with comparatively few words.
As regards the development of sea power, it is not the total number of square miles which a country contains, but the length of its coast-line and the character of its harbors that are to be considered. As to these it is to be said that, the geographical and physical conditions being the same, extent of sea-coast is a source of strength or weakness according as the population is large or small. A country is in this like a fortress; the garrison must be proportioned to the _enceinte_. A recent familiar instance is found in the American War of Secession. Had the South had a people as numerous as it was warlike, and a navy commensurate to its other resources as a sea power, the great extent of its sea-coast and its numerous inlets would have been elements of great strength. The people of the United States and the Government of that day justly prided themselves on the effectiveness of the blockade of the whole Southern coast. It was a great feat, a very great feat; but it would have been an impossible feat had the Southerners been more numerous, and a nation of seamen. What was there shown was not, as has been said, how such a blockade can be maintained, but that such a blockade is possible in the face of a population not only unused to the sea, but also scanty in numbers. Those who recall how the blockade was maintained, and the class of ships that blockaded during great part of the war, know that the plan, correct under the circumstances, could not have been carried out in the face of a real navy. Scattered unsupported along the coast, the United States ships kept their places, singly or in small detachments, in face of an extensive network of inland water communications which favored secret concentration of the enemy. Behind the first line of water communications were long estuaries, and here and there strong fortresses, upon either of which the enemy's ships could always fall back to elude pursuit or to receive protection. Had there been a Southern navy to profit by such advantages, or by the scattered condition of the United States ships, the latter could not have been distributed as they were; and being forced to concentrate for mutual support, many small but useful approaches would have been left open to commerce. But as the Southern coast, from its extent and many inlets, might have been a source of strength, so, from those very characteristics, it became a fruitful source of injury. The great story of the opening of the Mississippi is but the most striking illustration of an action that was going on incessantly all over the South, At every breach of the sea frontier, war-ships were entering. The streams that had carried the wealth and supported the trade of the seceding States turned against them, and admitted their enemies to their hearts. Dismay, insecurity, paralysis, prevailed in regions that might, under happier auspices, have kept a nation alive through the most exhausting war. Never did sea power play a greater or a more decisive part than in the contest which determined that the course of the world's history would be modified by the existence of one great nation, instead of several rival States, in the North American continent. But while just pride is felt in the well-earned glory of those days, and the greatness of the results due to naval preponderance is admitted, Americans who understand the facts should never fail to remind the overconfidence of their countrymen that the South not only had no navy, not only was not a seafaring people, but that also its population was not proportioned to the extent of the sea-coast which it had to defend.
IV. Number of Population. After the consideration of the natural conditions of a country should follow an examination of the characteristics of its population as affecting the development of sea power; and first among these will be taken, because of its relations to the extent of the territory, which has just been discussed, the number of the people who live in it. It has been said that in respect of dimensions it is not merely the number of square miles, but the extent and character of the sea-coast that is to be considered with reference to sea power; and so, in point of population, it is not only the grand total, but the number following the sea, or at least readily available for employment on ship-board and for the creation of naval material, that must be counted.
For example, formerly and up to the end of the great wars following the French Revolution, the population of France was much greater than that of England; but in respect of sea power in general, peaceful commerce as well as military efficiency, France was much inferior to England. In the matter of military efficiency this fact is the more remarkable because at times, in point of military preparation at the outbreak of war, France had the advantage; but she was not able to keep it. Thus in 1778, when war broke out, France, through her maritime inscription, was able to man at once fifty ships-of-the-line. England, on the contrary, by reason of the dispersal over the globe of that very shipping on which her naval strength so securely rested, had much trouble in manning forty at home; but in 1782 she had one hundred and twenty