The issue of freedom of the seasreferenced belowis most treatment prior to which of the following conflicts? "On the first of February, we intend to begin submarine warfare unrestricted. In spite of this it is our intention to keep neutral the United States of America. if this attempt is not successfulwe propose an alliance on the following basis with Mexico: that we shall make war together and together make peace. We shall give financial supportand it is understood that Mexico is to reconquer the lost territory in New Mexico, Texas and Arizona. The details are left for your settlement." Zimmermann, German Foreign MinisterJanuary 19, 1917