What changed woodrow wilson's opinion about entering world war 1

Hi Brainiac, thanks for asking a question here on

Woodrow Wilson's opinion began to change when the attack of the German U-boats killed many people in the US.

Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or post another question and send the link to me. -UnicornFudge aka Nadia 

Political forces often influence public opinion.