The crime of setting on foot or providing the means for a military expedition within the United States to make war against a foreign state with which we are at peace is one of an aggravated and dangerous character, and early engaged the attention of Congress. Whether the executive government possesses any, or what, power under the Constitution, independently of Congress, to prevent or punish this and similar offenses against the law of nations was a subject which engaged the attention of our most eminent statesmen in the time of the Administration of General Washington and on the occasion of the French Revolution. The act of Congress of the 5th of June, 1794, fortunately removed all the difficulties on this question which had theretofore existed. The fifth and seventh sections of this act, which relate to the present question, are the same in substance with the sixth and eighth sections of the act of April 20, 1818, and have now been in force for a period more than sixty years.

The military expedition rendered criminal by the act must have its origin, must "begin" or be "set on foot," in the United States; but the great object of the law was to save foreign states with whom we were at peace from the ravages of these lawless expeditions proceeding from our shores. The seventh section alone, therefore, which simply defines the crime and its punishment, would have been inadequate to accomplish this purpose and enforce our international duties. In order to render the law effectual it was necessary to prevent "the carrying on" of such expeditions to their consummation after they had succeeded in leaving our shores. This has been done effectually and in clear and explicit language by the authority given to the President under the eighth section of the act to employ the land and naval forces of the United States "for the purpose of preventing the carrying on of any such expedition or enterprise from the territories or jurisdiction of the United States against the territories or dominions of any foreign prince or state or of any colony, district, or people with whom the United States are at peace."

For these reasons, had Commodore Paulding intercepted the steamer Fashion, with General Walker and his command on board, at any period before they entered the port of San Juan de Nicaragua and conducted them back to Mobile, this would have prevented them from "carrying on" the expedition and have been not only a justifiable but a praiseworthy act.

The crime well deserves the punishment inflicted upon it by our laws. It violates the principles of Christianity, morality, and humanity, held sacred by all civilized nations and by none more than by the people of the United States. Disguise it as we may, such a military expedition is an invitation to reckless and lawless men to enlist under the banner of any adventurer to rob, plunder, and murder the unoffending citizens of neighboring states, who have never done them harm. It is a usurpation of the war-making power, which belongs alone to Congress; and the Government itself, at least in the estimation of the world, becomes an accomplice in the commission of this crime unless it adopts all the means necessary to prevent and to punish it.

It would be far better and more in accordance with the bold and manly character of our countrymen for the Government itself to get up such expeditions than to allow them to proceed under the command of irresponsible adventurers. We could then at least exercise some control over our own agents and prevent them from burning down cities and committing other acts of enormity of which we have read.

The avowed principle which lies at the foundation of the law of nations is contained in the divine command that "all things whatsoever ye would that men should do to you do ye even so to them." Tried by this unerring rule, we should be severely condemned if we shall not use our best exertions to arrest such expeditions against our feeble sister Republic of Nicaragua. One thing is very certain, that a people never existed who would call any other nation to a stricter account than we should ourselves for tolerating lawless expeditions from their shores to make war upon any portion of our territories. By tolerating such expeditions we shall soon lose the high character which we have enjoyed ever since the days of Washington for the faithful performance of our international obligations and duties, and inspire distrust against us among the members of the great family of civilized nations.

But if motives of duty were not sufficient to restrain us from engaging in such lawless enterprises, our evident interest ought to dictate this policy. These expeditions are the most effectual mode of retarding American progress, although to promote this is the avowed object of the leaders and contributors in such undertakings.

It is beyond question the destiny of our race to spread themselves over the continent of North America, and this at no distant day should events be permitted to take their natural course. The tide of emigrants will flow to the south, and nothing can eventually arrest its progress. If permitted to go there peacefully, Central America will soon contain an American population which will confer blessings and benefits as well upon the natives as their respective Governments. Liberty under the restraint of law will preserve domestic peace, whilst the different transit routes across the Isthmus, in which we are so deeply interested, will have assured protection.

Nothing has retarded this happy condition of affairs so much as the unlawful expeditions which have been fitted out in the United States to make war upon the Central American States. Had one-half the number of American citizens who have miserably perished in the first disastrous expedition of General Walker settled in Nicaragua as peaceful emigrants, the object which we all desire would ere this have been in a great degree accomplished. These expeditions have caused the people of the Central American States to regard us with dread and suspicion. It is our true policy to remove this apprehension and to convince them that we intend to do them good, and not evil. We desire, as the leading power on this continent, to open and, if need be, to protect every transit route across the Isthmus, not only for our own benefit, but that of the world, and thus open a free access to Central America, and through it to our Pacific possessions. This policy was commenced under favorable auspices when the expedition under the command of General Walker escaped from our territories and proceeded to Punta Arenas. Should another expedition of a similar character again evade the vigilance of our officers and proceed to Nicaragua, this would be fatal, at least for a season, to the peaceful settlement of these countries and to the policy of American progress. The truth is that no Administration can successfully conduct the foreign affairs of the country in Central America or anywhere else if it is to be interfered with at every step by lawless military expeditions "set on foot" in the United States.

JAMES BUCHANAN