Final answer:
President Wilson's 'War Message to Congress' supported his pro-war stance through a mixture of opinions and factual details, outlining the moral imperative and presenting the Fourteen Points for a just postwar world.
Step-by-step explanation:
President Woodrow Wilson's speech, "Wilson's War Message to Congress," was structured to support his message by presenting a combination of both his opinions and factual information to make a clear argument for war against Germany. Wilson initiated a propaganda campaign to promote the 'America First' message, reinforcing national unity and preparing the public for the possibility of entering the war. Additionally, his Fourteen Points outlined idealistic goals for the postwar world, emphasizing moral causes over territorial gains or wealth, which was a strategic element to garner support among Americans and to attempt to sway the international community. Despite resistance from European powers, Wilson's articulation of a moral imperative and call for an end to Germany's unrestricted submarine warfare provided the basis for his request to Congress to declare war.