Unrestricted Submarine Warfare (1 ene 1917 año – 1 ene 1918 año)

Descripción:

Cause:

1. result of desperation
2. belief that ferocity of tactic might keep America out of the war if results were spectacular

Effect:

1. Sinking of the Lusitania
2. killed citizens
3. contributed to U.S. entry into WW1

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