Mr. Seward to Mr. Motley
Sir: I have had the honor to receive your despatch of the 27th of March, No. 155, which brings the important announcement that a treaty, called a “military supplementary convention,” was ratified on the 15th of that month between the Emperor of Austria and the Prince Maximilian, who claims to be an emperor in Mexico.
You inform me that it is expected that about one thousand volunteers will be shipped (under this treaty) from Trieste to Yera Cruz very soon, and that at least as many more will be shipped in the autumn.
I have heretofore given you the President’s instructions to ask for explanations, and, conditionally, to inform the government of Austria that the despatch of military expeditions by Austria under such an arrangement as the one which seems now to have been consummated would be regarded with serious concern by the United States.
The subject has now been further considered in connexion with the official information thus recently received. The time seems to have arrived when the attitude of this government in relation to Mexican affairs should be once again frankly and distinctly made known to the Emperor of Austria, and all other powers whom it may directly concern. The United States, for reasons which seem to them to be just, and to have their foundation in the laws of nations, maintain that the domestic republican government with which they are in relations [Page 837] of friendly communication is the only legitimate government existing in Mexico; that a war has for a period of several years been waged against that republic by the government of France, which war began with a disclaimer of all political or dynastic designs; that that war has subsequently taken upon itself, and now distinctly wears, the character of a European intervention to overthrow that domestic republican government, and to erect in its stead a European imperial military despotism by military force. The United States, in view of the character of their own political institutions, their proximity and intimate relations towards Mexico, and their just influence in the political affairs of the American continent, cannot consent to the accomplishment of that purpose by the means described. The United States have therefore addressed themselves, as they think, seasonably to the government of France, and have asked that its military forces, engaged in that objectionable political invasion, may desist from further intervention and be withdrawn from Mexico.
A copy of the last communication upon this subject, which was addressed by us to the government of France, is herewith transmitted for your special information. This paper will give you the true situation of the question. It will also enable you to satisfy the government of Vienna that the United States must be no less opposed to military intervention for political objects hereafter in Mexico by the government of Austria, than they are opposed to any further intervention of the same character in that country by France.
You will, therefore, at as early a day as may be convenient, bring the whole case, in a becoming manner, to the attention of the imperial royal government. You are authorized to state that the United States sincerely desire that Austria may find it just and expedient to come upon the same ground of non-intervention in Mexico which is maintained by the United States, and to which they have invited France.
You will communicate to us the answer of the Austrian government to this proposition.
This government could not but regard as a matter of serious concern the despatch of any troops from Austria for Mexico while the subject which you are thus directed to present to the Austrian government remains under consideration.
I am, sir, your obedient servant,
J. Lothrop Motley, Esq., &c., &c., Vienna.