The correct answer to this open question is the following.
The question is referring to the Woodrow Wilson speech before Congress on April 2, 1917, when he addressed Congress to ask for a declaration of war against Germany and enter World War 1.
The words phrases that Wilson uses to persuade his listeners are confident and powerful phrases such as "the present German submarine warfare against commerce is a warfare against mankind." Or this other: "is a war against all nations." Or this one: "the menace of that peace and freedom lies in the existence of autocratic governments backed by organized force which is controlled wholly by their will, not by the will of their people."