By the President of the United States of America
There is reason to believe that an armed expedition is about to be fitted out in the United States with an intention to invade the island of Cuba or some of the Provinces of Mexico. The best information which the Executive has been able to obtain points to the island of Cuba as the object of this expedition. It is the duty of this Government to observe the faith of treaties and to prevent any aggression by our citizens upon the territories of friendly nations. I have therefore thought it necessary and proper to issue this my proclamation to warn all citizens of the United States who shall connect themselves with an enterprise so grossly in violation of our laws and our treaty obligations that they will thereby subject themselves to the heavy penalties denounced against them by our acts of Congress and will forfeit their claim to the protection of their country. No such persons must expect the interference of this Government in any form on their behalf, no matter to what extremities they may be reduced in consequence of their conduct. An enterprise to invade the territories of a friendly nation, set on foot and prosecuted within the limits of the United States, is in the highest degree criminal, as tending to endanger the peace and compromise the honor of this nation; and therefore I exhort all good citizens, as they regard our national reputation, as they respect their own laws and the laws of nations, as they value the blessings of peace and the welfare of their country, to discountenance and prevent by all lawful means any such enterprise; and I call upon every officer of this Government, civil or military, to use all efforts in his power to arrest for trial and punishment every such offender against the laws providing for the performance of our sacred obligations to friendly powers.
Given under my hand the 11th day of August, A. D. 1849, and the seventy-fourth of the Independence of the United States.
By the President:
J. M. CLAYTON,
Secretary of State .