33.7k views
16 votes
The USA's decision to enter WWI was influenced MOST DIRECTLY by the Germans’... *

Invasion of France
Introduction of poison gas
Development of the Schlieffen Plan
Use of unrestricted submarine warfare

User Raghumudem
by
4.0k points

1 Answer

3 votes
Use of unrestricted submarine warfare.

Let me know if this helps!
User Vignesh Babu M D
by
4.0k points