Question

In your opinion, what was the major reason the U.S had to adopt an “interventionist foreign policy” and enter WWI

Answer 1

Germany was attacking U.S merchant ships going to Britan and did not abide by the terms of no submarines so the U.S join the triple entente and adopted the interventionist foreign policy.

Step-by-step explanation:

Answer 2

The US had to enter World War I for one simple reason: shipping.

The Germans blundered and announced that they would commence unrestricted warfare that included sinking any ship suspected of supplying Allied powers.

This annoyed the US.