Watch Strike Missions: U-Boat with Fubo for $0 Today
On Feb. 4, 1915, Germany declared a war zone around Britain, within which merchant ships were sunk without warning; the unrestricted submarine warfare angered neutral countries, especially the United States.
On Feb. 4, 1915, Germany declared a war zone around Britain, within which merchant ships were sunk without warning; the unrestricted submarine warfare angered neutral countries, especially the United States.
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