What event finally caused president Wilson to ask do a declaration Of war against Germany?

President Wilson asked for a declaration of war against Germany primarily due to the resumption of unrestricted submarine warfare by the German Navy, which posed a direct threat to American ships and lives. Additionally, the interception of the Zimmerman Telegram, in which Germany proposed a military alliance with Mexico against the United States, further inflamed public opinion and solidified the call for action. These events collectively pushed Wilson to abandon his earlier stance of neutrality and seek congressional approval for war.