How and why America joined with the Allies against Germany in April, 1917, is told in the three articles following. The summaries contained therein are official, and the war message of President Wilson condenses the reasons which impelled the United States, after long delay, to throw the force of its strength and resources against the German Empire. WHY AMERICA BROKE WITH GERMANY PRESIDENT WOODROW WILSON [Sidenote: Germany proclaims ruthless submarine warfare.] The Imperial German Government on the 31st day of January announced to this Government and to the Governments of the other neutral nations that on and after the 1st day of February, the present month, it would adopt a policy with regard to the use of submarines against all shipping seeking to pass through certain designated areas of the high seas, to which it is clearly my duty to call your attention. [Sidenote: The _Sussex_ case.] Let me remind the Congress that on the 18th of April last, in view of the sinking on the 24th of March of the cross-channel steamship _Sussex_ by a German submarine without summons or warning, and the consequent loss of lives of several citizens of the United States who were passengers aboard her, this Government addressed a note to the Imperial German Government, in which it made the following statement: [Sidenote: The note to the Imperial German Government.] "If it is still the purpose of the Imperial German Government to prosecute relentless and indiscriminate warfare against vessels of commerce by the use of submarines without regard to what the Government of the United States must consider the sacred and indisputable rules of international law and the universally recognized dictates of humanity, the Government of the United States is at last forced to the conclusion that there is but one course it can pursue. Unless the Imperial Government should now immediately declare and effect an abandonment of its present methods of submarine warfare against passenger and freight carrying vessels, the Government of the United States can have no choice but to sever diplomatic relations with the German Empire altogether." In reply to this declaration the Imperial German Government gave this Government the following assurance: [Sidenote: Germany's assurances to the United States.] "The German Government is prepared to do its utmost to confine the operations of war for the rest of its duration to the fighting forces of the belligerents, thereby also insuring the freedom of the seas, a principle upon which the German Government believes now, as before, to be in agreement with the Government of the United States. [Sidenote: Promises that merchant vessels shall not be sunk without warning.]