In the wake of Catalonia's referendum on independence, Spanish Prime Minister Mariano Rajoy continued to argue, as he had in the weeks leading up to the vote, that any attempt by Catalans to become an independent state violates "the indissoluble unity of the Spanish nation, the common and indivisible homeland of all Spaniards."

Americans watching with interest could hardly have missed the similarity to U.S. President Abraham Lincoln's first inaugural speech, in which he declared, "It is safe to assert that no government proper ever had a provision in its organic law for its own termination."

The difference is Lincoln was doing just what he said he was doing, "asserting." His novel theory had no basis in the words of the U.S. Constitution itself and contradicted both the Declaration of Independence and the ratification statements made by three states, including Virginia, who all reserved the right to secede from the union as a condition of ratification.