What did factor changed Woodrow Wilson opinion about entering world war l?

Woodrow Wilson's opinion about entering World War I shifted primarily due to Germany's resumption of unrestricted submarine warfare and the sinking of civilian ships, such as the Lusitania, which resulted in American casualties. Additionally, the interception of the Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the United States, heightened fears of national security threats. These factors, combined with growing public sentiment for intervention, ultimately compelled Wilson to advocate for entering the war in 1917.