The tie was broken within twenty years. It may be that the Nationalist leaders, or some of them, do not desire separation; but it by no means follows that a concession of their demands would not lead to that result. Franklin, in 1774, had an interview with Chatham, in which he says-- "I assured him that, having more than once travelled almost from one end of the continent (of America) to the other, and kept a great variety of company, eating, drinking, and conversing with them freely, I never had heard in any conversation from any person, drunk or sober, the least expression of a wish for a separation, or a hint that such a thing would be advantageous to America."[29] And yet independence came within ten years. In the case of the United Kingdom there is no need to consider in detail how serious would be the effects--naval, military, and economic--of separation, for the gravity of such a contingency is admitted by all. Admiral Mahan, the American naval expert, writes that-- "the ambition of the Irish separatists, realised, might be even more threatening to the national life of Great Britain than the secession of the South was to that of the American Union.... The instrument for such action in the shape of an independent Parliament could not safely be trusted even to avowed friends." Some Home Rulers are able to-- "rise superior to the philosophy, as fallacious in fact as it is base and cowardly in purpose, which sets the safety of a great nation above the happiness and prosperity of a small one,"[30] but to less lofty souls it appears that the safety of the nation is paramount, and that upon it depends the prosperity of each of its component parts. In the next place, in considering whether complete "colonial" self-government can be conceded to Ireland, it must not be forgotten that the island is bi-racial, that the two races differ widely in character, in politics, and in religion, and that the differences are apt to find vent in violent conflict or secret attacks. Further, Ireland has for generations been the scene of a revolt against one particular species of property, the ownership of land; and although under the operation of the Land Purchase Acts this cause of conflict tends to abate, it still breaks out from time to time in the form of cattle drives and attacks on "land grabbers."[31] Hitherto we have, broadly speaking, kept the peace. That we should now forsake this duty, and, washing our hands of Ireland, leave the Protestant and the landowner, at or small, to his fate is unthinkable.