Between the addresses of January 8 and the Armistice, the President delivered other addresses in which he elaborated some of the principles of the Fourteen Points. Of special significance were his speeches of February 11, July 4, and September 27. In the last his mind centered on the League of Nations. "There can be no leagues or alliances or special covenants and understandings within the general and common family of the League of Nations," he declared, and "there can be no special selfish economic combinations within the League, and no employment of any form of economic boycott or exclusion, except as the power of economic penalty, by exclusion from the markets of the world, may be vested in the League of Nations itself as a means of discipline and control." In conclusion he said that the United States was prepared "to assume its full share of responsibility for the maintenance of the common covenants and understandings upon which peace must henceforth rest." We now know from the published memoirs of German and Austrian statesmen that President Wilson's speeches made a profound impression on the peoples of Central Europe. His utterances in behalf of the oppressed nationalities, not only Belgium, Serbia, and Poland, but also the Czecho-Slovaks and the Jugo-Slavs, became stronger and more frequent during the spring and summer of 1918, and solidified the opposition to Germany at a critical period of the war. On September 3 he recognized the Czecho-Slovak National Council as a belligerent government. This meant the break-up of the Austro-Hungarian Empire, which had not been contemplated at an earlier period, but, as he stated in his reply to the Austrian request for an armistice in October, conditions had changed since the announcement of the Fourteen Points, and these peoples would no longer be satisfied with mere autonomy.