The question whether the United States could constitutionally maintain an army and navy, in time of peace, was, under the Articles of Confederation, not free from difficulty; but it became of imminent practical importance, under the treaty of peace. That treaty provided for an immediate withdrawal of the British forces from all posts and fortifications within the United States; and it became at once an important question, whether these posts and fortifications--especially those within certain districts, the jurisdiction and property of which had not been constitutionally ascertained--should be garrisoned by troops of the United States, or of the States within which they were situated. There was also territory appertaining to the United States, not within the original claim of the United States. The whole of the Western frontier required defence. The navigation of the Mississippi and the lakes, and the rights of the fisheries and of foreign commerce, all belonging to the United States, and depending on the laws of nations and treaty stipulations, demanded the joint protection of the Union, and could not with propriety be left to the separate establishments of the States. But the Articles of Confederation contained no express provision for the establishment and maintenance of any military and naval forces during peace. They empowered the United States, generally, (and without mention of peace or war,) to build and equip a navy, and to agree upon the number of land forces to be raised, and to call upon the States to furnish their quotas. But they also declared that no vessels of war should be kept up by any State in time of peace, except such number only as should be deemed necessary by Congress for the defence of such State or its trade; and that no body of forces should be kept up by any State in time of peace, except such number only as Congress should deem requisite to garrison the posts necessary for the defence of such State. This provision might be construed to imply, that, in time of peace, the general defence was to be provided for by the forces of each State, and, in time of war, by those of the Union. But it was the opinion of Hamilton, that the restrictions on the powers of the States, with regard to maintaining forces during peace, could not with propriety be said to contain any directions to the United States, or to contravene the positive power vested in the latter to raise both sea and land forces, without mention of peace or war. He strengthened this view by the capital inconvenience of the contrary construction, and by the manifest necessities of the country, which could only be provided for by the power of the Union. If the United States could have neither army nor navy, until war had been declared, they would be obliged to begin to create both at the very moment when both were needed in actual hostilities; and, if the States were to be intrusted with the defence of