Which of the following caused the Wilson administration to break diplomatic relations with Germany?

A) The sinking of the Sussex
B) The decision by the German government to engage in unrestricted submarine warfare
C) A request from the British prime minister
D) The Zimmermann telegram

Sussex

A county in South East England, known for its historic significance and geographical features.

Unrestricted Submarine Warfare

A type of naval warfare in which submarines attack merchant ships without warning, famously used by Germany during both World Wars.

Zimmermann Telegram

A secret communication sent by Germany proposing a military alliance with Mexico in the event of the United States entering World War I against Germany, which helped sway US public opinion towards war.