In reviewing the career of Mr. Calhoun it would seem that the great error and mistake of his life was his disloyalty to the Union. When he advocated State rights as paramount over those of the general government he merely took the ground which was discussed over and over again at the formation of the Constitution, and which resulted in a compromise that, with control over matters of interest common to all States, the central government should have no power over the institution of slavery, which was a domestic affair in the Southern States. Only these States, it was settled, had supreme control over their own "peculiar institution." As a politician, representing Southern interests, he cannot be severely condemned for his fear and anger over the discussion of the slavery question, which, politically considered, was out of the range of Congressional legislation or popular agitation. But when he advocated or threatened the secession of the Southern States from the Union, unless the slavery question was let alone entirely both by Congress and the Northern States, he was unpatriotic, false in his allegiance, and unconstitutional in his utterances. A State has a right to enter the Union or not, remaining of course, in either case, United States territory, over which Congress has legislative power. But when once it has entered into the Union, it must remain there as a part of the whole. Otherwise the States would be a mere league, as in the Revolutionary times. Mr. Calhoun had a right to bring the whole pressure of the slave States on a congressional vote on any question. He could say, as the Irish members of Parliament say, "Unless you do this or that we will obstruct the wheels of government, and thus compel the consideration of our grievances, so long as we hold the balance of power between contending parties." But it is quite another thing for the Irish legislators to say, "Unless you do this or that, we will secede from the Union," which Ireland could not do without war and revolution. Mr. Calhoun, in his onesidedness, entirely overlooked the fact that the discontented States could not secede without a terrible war; for if there is one sentiment dear to the American people, it is the preservation of the Union, and for it they will make any sacrifice.