Our first step is to emphasize how the free-labor system which prevailed in the north, and the slave-labor system which prevailed in the south, were utterly incompatible. Free labor is far cheaper and more efficient than slave labor. It had consequently superseded slavery in the entire enlightened world. But certain exceptional peculiarities of climate, soil, and products planted made slavery profitable in the south. To maintain the market value of the slaves two things were needed: (1) the competition of free labor and the import of cheap slaves must be rigorously prevented; (2) a vast reserve of virgin soil, both to replace the plantations rapidly wearing out and to afford more land for the multiplying slaves. The fact last mentioned made it vital to the south to appropriate such parts of the soil of the Territories as suited her cotton and other staples. Therefore whenever she made such an appropriation she turned it into a slave State; for thus the competition of free labor would be effectually excluded therefrom. The much more rapid increase of her population made appropriation of lands in the Territories likewise vital to the north. Hers were all free-labor interests, as the south's were all slave-labor interests; and whenever the former appropriated any of the Territories, she made a State prohibiting slavery in order to protect her free-labor interests. The north was not excluded by nature from any part of the public domain as the other section was. Her free labor could be made productive everywhere in it, and she really needed the whole. Thus the brothers of the north and the brothers of the south commenced to strive with one another over dividing their great inheritance. The former wanted lands for themselves, their sons, and daughters in all the Territories possible made into States protecting their free-labor system; the latter wanted all of the Territories suiting them made into States protecting their slave-labor system. What ought especially to be recognized by us now is that this contention was between good, honest, industrious, plain, free-labor people on one side, and good, honest, industrious, plain, slave-labor people on the other, those on each side doing their best, as is the most common thing in the world, to gain and keep the advantage of those of the other. It was natural, it was right, it was most laudable that every householder, whether northerner or southerner, should do his utmost to get free land for himself and family. This fact--which is really the central, foundation, and cardinal one of all the facts which brought the brothers' war--must be thoroughly understood, otherwise the longer one contemplates this exciting theme the further astray from fact and reasonableness he gets.