Question

If you had to name one single event or development that was primarily responsible for the United States entering World War I, what would it be?

Answer 1

Germany's resumption of submarine attacks on passenger and merchant ships

Step-by-step explanation:

the primary motivation behind, this beacuse they were only giving supplies and aid to the allies, and german wanted to neutralize all allies with their enemies which cause Wilson's decision to lead the United States into World War I.