The obvious meaning of this article is, that the inhabitants of Louisiana are incorporated, by it, into the Union, upon the same footing that the Territorial Governments are, and, like them, the Territory, when the population is sufficiently numerous, must be admitted as a State, with every right of any other State. Have the President and Senate a constitutional right to do all this? When we advert to the constitution, we shall find that the President, by and with the advice and consent of the Senate, may make treaties. Now, say gentlemen, this power is undefined, and one gentleman says, it is unlimited. True, there is no definition in words of the extent and nature of the treaty-making power. Two modes of ascertaining its extent have been mentioned: one is, by ascertaining the extent of the same power among the monarchs of Europe, and making that the standard of the treaty-making power here; and the other is, to limit the power of the President and Senate, in respect to treaties, by the constitution and the nature and principles of our Government. Upon the first criterion, it is obvious that we cannot obtain any satisfactory definition of the treaty-making power, as applicable to our Government. The paragraph in the constitution, which says that “new States may be admitted by Congress into this Union,” has been quoted to justify this treaty. To this, two answers may be given, either of which are conclusive in my favor. First, if Congress have the power collectively of admitting Louisiana, it cannot be vested in the President and Senate alone. Secondly, Congress have no power to admit new foreign States into the Union, without the consent of the old partners. The article of the constitution, if any person will take the trouble to examine it, refers to domestic States only, and not at all to foreign States; and it is unreasonable to suppose that Congress should, by a majority only, admit new foreign States, and swallow up, by it, the old partners, when two-thirds of all the members are made requisite for the least alteration in the constitution. The words of the constitution are completely satisfied by a construction which shall include only the admission of domestic States, who were all parties to the Revolutionary war, and to the compact; and the spirit of the association seems to embrace no other. But I repeat it, if the Congress collectively has this power, the President and Senate cannot, of course, have it exclusively. I think, sir, that, from a fair construction of the constitution, and an impartial view of the nature and principles of our association, the President and Senate have not the power of thus obtruding upon us Louisiana.