What the potato was to Irish agriculture, cotton is to the dominant branch of Great Britain s industry. On its processing depends the subsistence of a mass of the population which is greater than the whole population of Scotland or two-thirds of the present population of Ireland. According to the 1861 census, the population of Scotland was 3,061,117, and that of Ireland only 5,764,543, while more than four million people in England and Scotland live directly or indirectly on the cotton industry. True, the cotton plant has not contracted any disease. Neither is its production the monopoly of a few areas of the world. On the contrary, no other plant providing material for clothing thrives on such extensive areas in America, Asia and Africa.. The cotton monopoly of the slave-owning states of the American Union is not natural, but historically shaped. It grew and developed simultaneously with the monopoly of the English cotton industry on the world market. ... Suddenly the American Civil War threatens this mainstay of English industry. While the Union blockades the ports of the Southern States to prevent the export of this year s cotton harvest and thereby cut off the secessionists main source of income, the Confederation imparts compulsive force to this blockade merely by its decision not to export a single bale of cotton voluntarily and, moreover, to force England to come and fetch cotton herself from the southern ports. England is to be driven to break through the blockade by force, to declare war on the Union, and thus to throw her sword on the scales in favour of the slave-owning states.
Karl Marx in Die Presse 1861