The Great War: Week by Week 100 Years Later S04E14 - Week 141: The United States Declares War on Germany

Diplomatic tensions after the return of German unrestricted submarine warfare and the aftermath of the Zimmermann telegram lead to the United States declaration of war on Germany this week 100 years ago. Meanwhile the British and French high command are still debating the upcoming offensive, namely the Battle of Arras which includes taking the contested Vimy Ridge and the Nivelle Offensive at the Chemin Des Dames.