I WILL BE GIVING BRAINLIEST! Why did this message lead the United States to declare war?

Mexico entered the war on the side of Germany.
Mexico did not respond to the offer that was made.
Germany threatened the territory of the United States.
Germany needed the support of the United States to win.

idk

explanation: idk

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.

explanation: