What event in 1917 most benefited the Allies?

Question

A. Germany agreed to end unrestricted submarine warfare.
B. Russia signed the Treaty of Brest-Litovsk.
C. Woodrow Wilson published his Fourteen Points.
D. The United States declared war against Germany.

Answer 1

The event in 1917 that most benefited the Allies was the United States declaring war against Germany. Therefore, the correct answer to the question is option D.