So long and in so far as the Commonwealth does not exercise its jurisdiction, such jurisdiction remains with the States. This does not apply in cases where the Commonwealth possesses exclusive jurisdiction. The National Cabinet may object to State laws relating to the subjects of Article 7, Number 13, whenever the general welfare of the Commonwealth is affected thereby. ARTICLE 13 The laws of the Commonwealth are supreme over the laws of the States which conflict with them. If doubt arises, or difference of opinion, whether State legislation is in harmony with the law of the Commonwealth, the proper authorities of the Commonwealth or the central authorities of the States, in accordance with more specific provisions of a national law, may have recourse to the decision of a supreme judicial court of the Commonwealth. ARTICLE 14 The laws of the Commonwealth will be executed by the State authorities, unless otherwise provided by national law. ARTICLE 15 The National Cabinet supervises the conduct of affairs over which the Commonwealth has jurisdiction. In so far as the laws of the Commonwealth are to be carried into effect by the State authorities, the National Cabinet may issue general instructions. It has the power to send commissioners to the central authorities of the States, and, with their consent, to the subordinate State authorities, in order to supervise the execution of national laws. It is the duty of the State Cabinets, at the request of the National Cabinet, to correct any defects in the execution of the national laws. In case of dispute, either the National Cabinet or that of the State may have recourse to the decision of the Supreme Judicial Court, unless another court is prescribed by national law. ARTICLE 16 The officers directly charged with the administration of national affairs in any State shall, as a rule, be citizens of that State. The officers, employés and workmen of the national administration shall, if they so desire, be employed in the districts where they reside as far as is possible and not inconsistent with their training and with the requirements of the service. ARTICLE 17 Every State must have a republican constitution. The representatives of the People must be elected by the universal, equal, direct and secret suffrage of all German citizens, both men and women, according to the principles of proportional representation. The State Cabinet shall require the confidence of the representatives of the People. The principles in accordance with which the representatives of the People are chosen apply also to municipal elections; but by State law a residence qualification not exceeding one year of residence in the municipality may be imposed in such elections. ARTICLE 18