Answer:
Sadness.
Step-by-step explanation:
President Woodrow Wilson's 2nd April, 1917 "War Message to Congress" was a a request directing the Congress to declare war against Germany. And this declaration would become the event that led the US to enter the First World War.
In his message, President Wilson declares reveals why he thinks America must join the war. He said, "American ships have been sunk, American lives taken" which was why participating in the war is the only solution left to stop the killings. Moreover, he also reiterated that such an act is not only directed to America alone, but to "other neutral and friendly nations [too]."
Thus, we can see that President Wilson is trying to evoke a feeling of sadness in his readers.