Unrestricted submarine warfare was one of the most important reasons on why the United States joined war. Unrestricted submarine warfare is an approach where submarines sink merchant ships without warning. February of 1915, Germany created U-boats. U-boats would sink enemy ships without any kind of warning. International law
Unrestricted submarine warfare was one of the most important reasons on why the United States joined war. Unrestricted submarine warfare is an approach where submarines sink merchant ships without warning. February of 1915, Germany created U-boats. U-boats would sink enemy ships without any kind of warning. International law