Clause 6. To provide for the punishment of counterfeiting the securities and current coin of the United States; Clause 7. To establish post offices and post roads; Clause 8. To promote the progress of science and useful arts, by securing, for limited times, to authors and inventors the exclusive right to their respective writings and discoveries; Clause 9. To constitute tribunals inferior to the Supreme Court; Clause 10. To define and punish piracies and felonies committed on the high seas, and offences against the law of nations; Clause 11. To declare war, grant letters of marque and reprisal, and make rules concerning captures on land and water; Clause 12. To raise and support armies, but no appropriation of money to that use shall be for a longer term than two years; Clause 13. To provide and maintain a navy; Clause 14. To make rules for the government and regulation of the land and naval forces; Clause 15. To provide for calling forth the militia to execute the laws of the Union, suppress insurrections and repel invasions; Clause 16. 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; Clause 17. 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 the 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, dockyards, and other needful buildings;--And Clause 18. 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. =Section IX.=--Clause 1. The migration or importation of such persons as any of the States now existing shall think proper to admit, shall not be prohibited by the Congress prior to the year one thousand eight hundred and eight, but a tax or duty may be imposed on such importation, not exceeding ten dollars for each person. Clause 2. The privilege of the writ of habeas corpus shall not be suspended, unless in cases of rebellion or invasion the public safety may require it. Clause 3. No bill of attainder or ex-post-facto law shall be passed. Clause 4. No capitation or other direct tax shall be laid, unless in proportion to the census or enumeration herein before directed to be taken. Clause 5. No tax or duty shall be laid on articles exported from any State.