The Extension of the European System to the Western Hemisphere Declared Incompatible with the American System, by President Monroe.
"The political system of the Allied Powers is essentially different ... from that of America. This difference proceeds from that which exists in their respective Governments, and to the defence of our own, which has been achieved by the loss of so much blood and treasure, and matured by the wisdom of their most enlightened citizens, and under which we have enjoyed unexampled felicity, this whole nation is devoted. We owe it, therefore, to candor and to the amicable relations existing between the United States and those Powers, to declare that we should consider any attempt on their part to extend their system to any portion of this hemisphere as dangerous to our peace and safety....
"It is impossible that the Allied Powers should extend their political system to any portion of either continent without endangering our peace and happiness."
President Monroe Annual Message of December 2, 1823
The American System Declared to Have Extended Itself to the Whole Western Hemisphere, by President John Quincy Adams
"Among the inquiries which were thought entitled to consideration before the determination was taken to accept the invitation [to the proposed Congress of the American Republics at Panama], was that whether the measure might not have a tendency to change the policy, hitherto invariably pursued by the United States, of avoiding all entangling alliances and all unnecessary political connections.
"Mindful of the advice given by the Father of our Country in his Farewell Address, that the great rule of conduct for us in regard to foreign nations is in extending our commercial relations, to have with them as little political connection as possible, and faithfully adhering to the spirit of that admonition, I can not overlook the reflection that the counsel of Washington in that instance, like all counsels of wisdom, was founded upon the circumstances in which our country and the world around us were situated at the time when it was given that the reasons assigned by him for his advice were that Europe had a set of primary interests which to us had none or a very remote relation, that hence she must be engaged in frequent controversies, the causes of which were essentially foreign to our concerns, that our detached and distant situation invited and enabled us to pursue a different course, that by our union and rapid growth, with an efficient Government, the period was not far distant when we might defy material injury from external annoyance, when we might take such an attitude as would cause our neutrality to be respected, and, with reference to belligerent nations, might choose peace or war, as our interests, guided by justice, should counsel."
Compare our situation and the circumstances of that time with those of the present day and what, from the very words of Washington then, would be his counsels to his countrymen now? Europe has still her set of primary interests, with which we have little or a remote relation. Our distant and detached situation with reference to Europe remains the same. But we were then the only independent nation of this hemisphere, and we were surrounded by European colonies, with the greater part of which we had no more intercourse than with the inhabitants of another planet. These colonies have now been transformed into eight independent nations, extending to our very borders, seven of them Republics like ourselves, with whom we have an immensely growing commercial and must have, and have already, important political connections, with reference to whom our situation is neither distant nor detached, whose political principles and systems of government, congenial with our own, must and will have an action and counteraction upon us and ours to which we cannot be indifferent if we would.
The rapidity of our growth, and the consequent increase of our strength, has more than realized the anticipations of this admirable political legacy. Thirty years have nearly elapsed since it was written, and in the interval our population, our wealth, our territorial extension, our power—physical and moral—have nearly trebled. Reasoning upon this state of things from the sound and judicious principles of Washington, must we not say that the period which he predicted, as then not far off, has arrived, that America has a set of primary interests which have none or a remote relation to Europe, that the interference of Europe, therefore, in those concerns should be spontaneously withheld by her upon the same principles that we have never interfered with hers, and that if she should interfere, as she may, by measures which may have a great and dangerous recoil upon ourselves, we might be called, in defence of our altars and firesides, to take an attitude which would cause our neutrality to be respected, and choose peace or war as our interest guided by justice, should counsel?
"The acceptance of this invitation, therefore, far from conflicting with the counsel or the policy of Washington, is directly deducible from and conformable to it. Nor is it less conformable to the views of my immediate predecessor, as declared in his Annual Message to Congress of the 2d December, 1823."