MEXICO. 223 8. To transmit, annually, to each of the two Chambers of the General Congress, a circumstantial account of the Re- ceipts and Expenditure of their respective treasuries; with the origin of each, and a note, containing a description of the agricultural and manufacturing industry of each State ; the new branches of industry that might be introduced, and the best mode of doing so, with a census of the population. 9. To transmit likewise copies of all the decrees, and laws, of their respective Congresses. (Article 161.) No State has liberty, without the consent of the General Congress, To establish any tonnage or harbour dues. To lay any tax upon importations or exportations. To maintain troops, or vessels of war. To enter into any transaction with Foreign Powers ; or de- clare war ; though hostilities may be commenced in cases of actual invasion. To enter into any transaction with other States of the Federation, respecting boundaries, or cession of territory. (Article 162.) MODE OF EFFECTING CHANGES IN THE CONSTITUTIONAL ACT. The General Congress alone has the power of determining any question that may arise with regard to the interpretation of any article of the Constitutional Act. (Article 165.) The Congresses of the States may make what representa- tions they think proper against any particular Articles of the Constitution ; but these cannot be taken into consideration by the General Congress before the year 1830. (Article 166.) The Congress of that year must confine itself to quahfy- ing, (or reporting upon) those representations which it thinks ought to be submitted to the consideration of the ensuing Congress ; and this report shall be communicated to the Pre-
