What was germany doing with their u- boats? how did it influence america?

Germany took up a stance of unrestricted submarine warfare, in which Germany sank any ships that was within a certain area regardless of the flag that was waving (whether owned by neutral or warring countries). Because of this, the US was outraged in the fact that their neutral stance was infringed upon, and following with the Zimmermann Telegram, the US officially joined the war on the Allied side.

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world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

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