The case of Somersett was that of a Virginia slave carried to England by his master in 1770, and who remained there two years. For some cause, he was confined on a vessel destined to Jamaica, where he was to be sold. Lord Mansfield, upon a return to a _habeas corpus_, states the question involved. "Here, the person of the slave himself," he says, "is the immediate subject of inquiry, Can any dominion, authority, or coercion, be exercised in this country, according to the American laws?" He answers: "The difficulty of adopting the relation, without adopting it in all its consequences, is indeed extreme, and yet many of those consequences are absolutely contrary to the municipal law of England." Again, he says: "The return states that the slave departed, and refused to serve; whereupon, he was kept to be sold abroad." "So high an act of dominion must be recognised by the law of the country where it is used. The power of the master over his slave has been extremely different in different countries." "The state of slavery is of such a nature, that it is incapable of being introduced on any reasons, moral or political, but only by positive law, which preserves its force long after the reasons, occasion, and time itself, from whence it was created, are erased from the memory. It is so odious, that nothing can be suffered to support it but positive law." That there is a difference in the systems of States, which recognise and which do not recognise the institution of slavery, cannot be disguised. Constitutional law, punitive law, police, domestic economy, industrial pursuits, and amusements, the modes of thinking and of belief of the population of the respective communities, all show the profound influence exerted upon society by this single arrangement. This influence was discovered in the Federal Convention, in the deliberations on the plan of the Constitution. Mr. Madison observed, "that the States were divided into different interests, not by their difference of size, but by other circumstances; the most material of which resulted partly from climate, but principally from the effects of their having or not having slaves. These two causes concur in forming the great division of interests in the United States."