Problem 1: Briefly explain why ONE of the following options most clearly marks the shift away from isolationism in the 1910s that led to U.S. entry into World War I.
- Preparedness Movement
- Tensions with Mexico
- Unrestricted submarine warfare
Problem 2: Provide an example of an event or development to support your explanation.
Problem 3: Briefly explain why one of the other options is not as useful to mark the shift toward U.S. entry into World War I.