What is the biggest event that caused the US to enter WW||?

Submarine warfare in the Atlantic kept tensions high, and Germany’s sinking of the British ocean liner Lusitania on May 7, 1915, killed more than 120 U.S. citizens and provoked outrage in the U.S. In 1917, Germany’s attacks on American ships and its attempts to meddle in U.S.-Mexican relations drew the U.S. into the war on the side of the Allies. The United States declared war on Germany on April 6, 1917.

Explanation:

i do believe that the correct answer is   (technical reasoning); luck

explanation:

the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.