Of the important questions of constitutional law now before the country, none more vitally affects the peace and harmony of our dual system of government than that of the power of a federal court to enjoin a state officer from enforcing the provisions of a state statute which is in conflict with the Constitution of the United States. This question usually arises in connection with the eleventh article of amendment, which provides that "the judicial power of the United States shall not be construed to extend to any suit in law or equity, commenced or prosecuted against one of the United States by citizens of another state, or by citizens or subjects of any foreign state." Serious controversies regarding the issuance of injunctions by federal courts against state officers have arisen in New York, North Carolina, Alabama, Missouri, Kansas, Minnesota, and other states. A convention of attorneys-general from a number of states, held at St. Louis in September and October, 1907, adopted a memorial to the President and Congress praying that the jurisdiction of the circuit courts of the United States might be curtailed in respect of suits brought to restrain state officers from enforcing state laws or the orders of state administrative boards. The President in his annual message to Congress called the matter to the attention of that body, and stated that discontent was often expressed with the use of the process of injunction by the courts where state laws were concerned. The assembling of Congress was marked by the introduction of numerous bills to curtail the power of the federal courts to issue injunctions and by the offering of several joint resolutions to amend the Constitution of the United States, which had the same object. The question will, perhaps, figure prominently in the next presidential campaign. It may, therefore, be appropriate to review at this time the history of the eleventh article of amendment to the Constitution of the United States in order to see what light that history throws upon the purpose of its framers. Did they intend, in prohibiting suits by an individual against a state, to deny to the courts of the United States the power to enjoin a state officer from enforcing a state statute in conflict with the Constitution of the United States?