jurisdiction to fix and ascertain the interpretation of those grants, restrictions, and prohibitions. The constitution has itself pointed out, ordained, and established that authority. How has it accomplished this great and essential end? By declaring, sir, that 'the constitution and the laws of the United States, made in pursuance thereof, shall be the supreme law of the land, any thing in the constitution or laws of any state to the contrary notwithstanding.'
"This, sir, was the first great step. By this, the supremacy of the constitution and laws of the United States is declared. The people so will it. No state law is to be valid, which comes in conflict with the constitution, or any law of the United States passed in pursuance of it. But who shall decide this question of interference? To whom lies the last appeal? This, sir, the constitution itself decides, also, by declaring, 'that the judicial power shall extend to all cases arising under the constitution and laws of the United States.' These two provisions, sir, cover the whole ground. They are, in truth, the keystone of the arch. With these, it is a constitution; without them, it is a confederacy. In pursuance of these clear and express provisions, congress established, at its very first session, in the judicial act, a mode for carrying them into full effect, and for bringing all questions of constitutional power to the final decision of the Supreme Court. It then, sir, became a government. It then had the means of self-protection; and, but for this, it would, in all probability, have been now among things, which are past. Having constituted the government, and declared its powers, the people have further said, that since somebody must decide on the extent of these powers, the government shall itself decide; subject, always, like other popular governments, to its responsibility to the people. And now, sir, I repeat, how is it, that a state legislature acquires any power to interfere? Who, or what, gives them the right to say to the people, 'We, who are your agents and servants for one purpose, will undertake to decide, that your other agents and servants, appointed by you for another purpose, have transcended the authority you gave them!' The reply would be, I think, not impertinent—'Who made you a judge over another's servants: To their own masters they stand or fall.'
"Sir, I deny this power of state legislatures altogether. It cannot stand the test of examination. Gentlemen may say, that in an extreme case, a state government might protect the people from intolerable oppression. Sir, in such a case, the people might protect themselves, without the aid of the state governments. Such a case warrants revolution. It must make, when it comes, a law for itself. A nullifying act of a state legislature cannot alter the case, nor make resistance any more lawful.
