6. The doctrine of secession--the right of a State, or a combination of States, to withdraw from the Union, was born of that war. It was repugnant to the New England States, and opposed by them, not with arms, but with argument and remonstrance, and refusal to vote supplies. They had a convention, famous under the name of Hartford, to which the design of secession was imputed. That design was never avowed by the convention, or authentically admitted by any leading member; nor is it the intent of this reference to decide upon the fact of that design. The only intent is to show that the existence of that convention raised the question of secession, and presented the first instance of the greatest danger in the working of the double form of our government--that of a collision between a part of the States and the federal government. This question, and this danger, first arose then--grew out of the war of 1812--and were hushed by its sudden termination; but they have reappeared in a different quarter, and will come in to swell the objects of the THIRTY YEARS' VIEW. At the time of its first appearance the right of secession was repulsed and repudiated by the democracy generally, and in a large degree by the federal party--the difference between a UNION and a LEAGUE being better understood at that time when so many of the fathers of the new government were still alive. The leading language in respect to it south of the Potomac was, that no State had a right to withdraw from the Union--that it required the same power to dissolve as to form the Union--and that any attempt to dissolve it, or to obstruct the action of constitutional laws, was treason. If, since that time, political parties and sectional localities, have exchanged attitudes on this question, it cannot alter the question of right, and may receive some interest from the development of causes which produce such changes. Secession, a question of speculation during the war of 1812, has become a practical question (almost) during the THIRTY YEARS; and thus far has been "compromised," not settled.