More than all, the revolution has made of Mexico a refuge for the enemies of the United States, first by allowing to be set up in its capital the central organization of the German spy and sabotage system in the Western world, and since the war by welcoming and aiding the bolshevists and radicals who are working openly for the overthrow of American institutions in this country and the destruction of American industry and trade in Mexico. This is a bitter record, but without it, as I have had to say of many things in this book, the picture cannot come clear to our eyes. We cannot, in justice to our own understanding, forget that since the death of Madero, and even before, the Mexican revolution has been but one movement. The rulers who have succeeded each other have all been of the same group, and those in power in 1921 are those who were scrambling for place within the same ruling group in 1913. “The revolution,” as one of them has said, “is the revolution.” And so it is in more senses than one. We but deceive ourselves if in our very genuine desire to give each new Mexican president a chance, we close our eyes to the obvious facts of his political heritage and the human tools he must use. Only one word more, and the tale of the golden geese is done. The protection which the American government has failed to give its traders and investors who have gone abroad has had an effect which those traders and investors must obviate before they step forth, at least into Mexico, again. Through the years of the Great War, our government, along with those of the Allies, put into effect in neutral countries, a “Black List” which was designed to keep German, Austrian and Turkish firms and their sympathizers from dealing and trading with the neutrals or with the peoples of the allied countries.