Before this, however, the state of public affairs had become extremely critical, by the commencement of the American civil war. My strongest feelings were engaged in this struggle, which, I felt from the beginning, was destined to be a turning point, for good or evil, of the course of human affairs for an indefinite duration. Having been a deeply interested observer of the Slavery quarrel in America, during the many years that preceded the open breach, I knew that it was in all its stages an aggressive enterprise of the slave-owners to extend the territory of slavery; under the combined influences of pecuniary interest, domineering temper, and the fanaticism of a class for its class privileges, influences so fully and powerfully depicted in the admirable work of my friend Professor Cairnes, "The Slave Power." Their success, if they succeeded, would be a victory of the powers of evil which would give courage to the enemies of progress and damp the spirits of its friends all over the civilized world, while it would create a formidable military power, grounded on the worst and most anti-social form of the tyranny of men over men, and, by destroying for a long time the prestige of the great democratic republic, would give to all the privileged classes of Europe a false confidence, probably only to be extinguished in blood.