Joseph Story,
Commentaries on the Constitution of the United States
(1833)
“ 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. ”
