In last analysis slavery may have been, probably was, the cause of the war; but, historically, it was not the motive. Lincoln's words--"I will save the Union with slavery, or I will save it without slavery, as the case may demand"--voiced the feeling prevalent in the military services, and also the will of the great body of the Northern people, whom he profoundly understood and in his own mental advance illustrated. I cannot but think that such an aim was more statesmanlike than would have been the attempt to overturn immediately and violently an entire social and economical system, for the establishment of which the current generation was not responsible. In the long run, to allow the tares of bondage to stand with the wheat of freedom was wiser than the wish prematurely to uproot. It had become the definite policy of the enemies of slavery to girdle the tree, by strict encompassing lines, leaving it to consequent sure process of decay. Its friends forced the issue. To the ones and to the others the harvest of generations, in the form it took, came unexpected and suddenly--a day of judgment, a crisis, like a thief in the night. It is a consummate proof of the accuracy of popular instinct, given time to work, that the uprising of 1861 rested upon recognition of the fact that the cause of the nation and of the world depended more upon the preservation of a single authority over all the territory involved, upon the consequent avoidance of future permanent oppositions, than it did upon the destruction of a particular institution, the life of which might be protracted, but under conditions of union must wane and ultimately expire. The gradual progress of decision by the American people was wiser than the abrupt action asked by foreign impatience; and abolition came with less shock and more finality as a military measure than it could as a political. Its advisability was more evident. If statesmanship is shown in bringing popular will to accord with national necessity, Lincoln was in this most sagacious; but not the least element in the tribute due him is that he was the barometer of popular impulse, measuring accurately the invisible force upon which depended the energy of that stormy period.