Why Did the United States enter World War I?
1. Unrestricted submarine warfare.
4. U.S. Business Interests - US trade w/ the allies increased from 825 million in 1914 to 3.2 billion in 1916.
5. Zimmerman Note - Germany asked Mexico to enter the war against the US. We intercepted the note.
- Sinking of the Lusitania (1915)
- The "Sussex" pledge (1916)
- Germany renews unrestricted U Boat attacks (1917)
- Stressed German barbarism.
- Posters depicting the Kaiser as some sort of madman.
- Urged American to support allies throughout neutrality.
4. U.S. Business Interests - US trade w/ the allies increased from 825 million in 1914 to 3.2 billion in 1916.
5. Zimmerman Note - Germany asked Mexico to enter the war against the US. We intercepted the note.