If commerce does not include navigation, the government of the Union has no direct power over that subject, and can make no law prescribing what shall constitute American vessels, or requiring that they shall be navigated by American seamen. Yet this power has been exercised from the commencement of the government, has been exercised with the consent of all, and has been understood by all to be a commercial regulation. All America understands, and has uniformly understood, the word ''commerce,'' to comprehend navigation. It was so understood, and must have been so understood, when the constitution was framed. The power over commerce, including navigation, was one of the primary objects for which the people of America adopted their government, and must have been contemplated in forming it. The convention must have used the word in that sense, because all have understood it in that sense; and the attempt to restrict it comes too late.

If the opinion that ''commerce,'' as the word is used in the constitution, comprehends navigation also, requires any additional confirmation, that additional confirmation is, we think, furnished by the words of the instrument itself.

It is a rule of construction, acknowledged by all, that the exceptions from a power mark its extent; for it would be absurd, as well as useless, to except from a granted power, that which was not granted—that which the words of the grant could not comprehend. If, then, there are in the constitution plain exceptions from the power over navigation, plain inhibitions to the exercise of that power in a particular way, it is a proof that those who made these exceptions, and prescribed these inhibitions, understood the power to which they applied as being granted.

The 9th section of the 1st article declares, that ''no preference shall be given, by any regulation of commerce or revenue, to the ports of one State over those of another.'' This clause cannot be understood as applicable to those laws only which are passed for the purposes of revenue, because it is expressly applied to commercial regulations; and the most obvious preference which can be given to one port over another, in regulating commerce, relates to navigation. But the subsequent part of the sentence is still more explicit. It is, ''nor shall vessels bound to or from one State, be obliged to enter, clear, or pay duties, in another.'' These words have a direct reference to navigation.

The universally acknowledged power of the government to impose embargoes, must also be considered as showing, that all America is united in that construction which comprehends navigation in the word commerce. Gentlemen have said, in argument, that this is a branch of the war-making power, and that an embargo is an instrument of war, not a regulation of trade.

That it may be, and often is, used as an instrument of war, cannot be denied. An embargo may be imposed for the purpose of facilitating the equipment or manning of a fleet, or for the purpose of concealing the progress of an expedition preparing to sail from a particular port. In these, and in similar cases, it is a military instrument, and partakes of the nature of war. But all embargoes are not of this description. They are sometimes resorted to without a view to war, and with a single view to commerce. In such case, an embargo is no more a war measure, than a merchantman is a ship of war, because both are vessels which navigate the ocean with sails and seamen.

When Congress imposed that embargo which, for a time, engaged the attention of every man in the United States, the avowed object of the law was, the protection of commerce, and the avoiding of war. By its friends and its enemies it was treated as a commercial, not as a war measure. The persevering earnestness and zeal with which it was opposed, in a part of our country which supposed its interests to be vitally affected by the act, cannot be forgotten. A want of acuteness in discovering objections to a measure to which they felt the most deep rooted hostility, will not be imputed to those who were arrayed in opposition to this. Yet they never suspected that navigation was no branch of trade, and was, therefore, not comprehended in the power to regulate commerce. They did, indeed, contest the constitutionality of the act, but, on a principle which admits the construction for which the appellant contends. They denied that the particular law in question was made in pursuance of the constitution, not because the power could not act directly on vessels, but because a perpetual embargo was the annihilation, and not the regulation of commerce. In terms, they admitted the applicability of the words used in the constitution to vessels; and that, in a case which produced a degree and an extent of excitement, calculated to draw forth every principle on which legitimate resistance could be sustained. No example could more strongly illustrate the universal understanding of the American people on this subject.

The word used in the constitution, then, comprehends, and has been always understood to comprehend, navigation within its meaning; and a power to regulate navigation, is as expressly granted, as if that term had been added to the word ''commerce.''

To what commerce does this power extend? The constitution informs us, to commerce ''with foreign nations, and among the several States, and with the Indian tribes.''

It has, we believe, been universally admitted, that these words comprehend every species of commercial intercourse between the United States and foreign nations. No sort of trade can be carried on between this country and any other, to which this power does not extend. It has been truly said, the commerce, as the word is used in the constitution, is a unit, every part of which is indicated by the term.