"15. To provide for organizing, arming and disciplining the militia, and for governing such part of them as may be employed in the service of the United States, reserving to the States, respectively, the appointment of the officers and the authority of training the militia, according to the discipline prescribed by Congress; "16. To exercise exclusive legislation in all cases whatsoever, over such district (not exceeding ten miles square) as may, by cession of particular States, and the acceptance of Congress, become the seat of government of the United States, and to exercise like authority over all places purchased by the consent of the legislature of the State in which the same shall be, for the erection of forts, magazines, arsenals, dock yards and other needful buildings:--And "17. To make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the United States, or in any department or officer thereof." The powers enumerated in this section are very definite, and nothing we could say would make that fact appear more apparent. Now if these powers are conferred upon the general government by the common consent of all the States of the Union, or more especially by all the people of all the States, can any one State exercise any of those reserved powers? Most certainly not. But the framers of the constitution did not leave this to be inferred. They settled the question definitely in section ten. Here it is: "1. No State shall enter into any treaty, alliance, or confederation; grant letters of marque and reprisal; coin money; emit bills of credit; make anything but gold and silver coin a tender in payment of debts; pass any bill of attainder, ex post facto law, or law impairing the obligation of contracts; or grant any title of nobility. "2. No State shall, without the consent of the Congress, lay any imposts or duties on imports or exports, except what maybe absolutely necessary for executing its inspection laws; and the nett produce of all duties and imposts, laid by any State on imports or exports, shall be for the use of the treasury of the United States, and all such laws shall be subject to the revision and control of the Congress. No State shall, without the consent of Congress, lay any duty of tunnage, keep troops or ships of war in time of peace, enter into any agreement or compact with another State, or with a foreign power, or engage in war, unless actually invaded, or in such imminent danger as will not admit of delay." This section plainly and positively _prohibits_ the States from doing certain things _without the consent_ of Congress. They can neither contract alliances, collect revenue, coin money, nor engage in war in their capacity of States.