The Legislative Union was unnatural. The two islands, near as they were to each other, were on different planes of civilization, wealth, and economic development, without a common tradition, a common literature, or a common religion. Each had a temperament and genius of its own, and each needed a different channel of expression. Laws applicable to one island were meaningless or noxious in the other; taxation applicable to a rich industrial island was inappropriate and oppressive for a poor agricultural island. And upon a system comprising all these incompatibilities there was grafted the ruinous principle of ascendancy. There is nothing inherently strange about the difference between England and Ireland. Artificial land-frontiers often denote much sharper cleavages of sentiment, character, physique, language, history. A sea-frontier sometimes makes a less, sometimes a more, effective line of delimitation. Denmark and Sweden, France and England, are examples. Nor, on the other hand, did the profound differences between Ireland and England preclude the possibility of their incorporation in a political system under one Crown. We know, by a mass of experience from Federal and other systems, that elements the most diverse in language, religion, wealth, and tradition may be welded together for common action, provided that the union be voluntary and the freedom of the separate parts be preserved. The first conditions of a true union were lacking in the case of Ireland. The arrangement was not voluntary. It was accompanied by gross breach of faith, and it signified enslavement, not liberty.