WORLD HISTORY

Detailed explanation-1: -Unrestricted submarine warfare was first introduced in World War I in early 1915, when Germany declared the area around the British Isles a war zone, in which all merchant ships, including those from neutral countries, would be attacked by the German navy.

Detailed explanation-2: -At the dawn of 1917, the German high command forced a return to the policy of unrestricted submarine warfare, engineering the dismissal of opponents of the policy that aimed to sink more than 600, 000 tons of shipping a month.

Detailed explanation-3: -Unrestricted submarine warfare is the practice of using submarines to attack and sink all forms of enemy shipping, whether they are military or civilian. It is most closely associated with the First World War when Germany’s decision to use USW brought the US into the war and led to their defeat.

Detailed explanation-4: -To capitalize on the shift, German leaders agreed in January of 1917 to resume unrestricted submarine warfare to break the devastating army stalemate in Europe and the British navy’s successful blockade of critical German supply ports.

Detailed explanation-5: -On January 31, 1917, Germany announces the renewal of unrestricted submarine warfare in the Atlantic as German torpedo-armed submarines prepare to attack any and all ships, including civilian passenger carriers, said to be sighted in war-zone waters.