US Presidency
1854

International comity, the obligations of treaties, and the express provisions of law alike required, in my judgment, that all the constitutional power of the Executive should be exerted to prevent the consummation of such a violation of positive law and of that good faith on which mainly the amicable relations of neighboring nations must depend. In conformity with these convictions of public duty, a proclamation was issued to warn all persons not to participate in the contemplated enterprise and to invoke the interposition in this behalf of the proper officers of the Government. No provocation whatever can justify private expeditions of hostility against a country at peace with the United States. The power to declare war is vested by the Constitution in Congress, and the experience of our past history leaves no room to doubt that the wisdom of this arrangement of constitutional power will continue to be verified whenever the national interest and honor shall demand a resort to ultimate measures of redress.