The Allies' development and use of both the escorted convoy system and Anti-Submarine Warfare (ASW) weapons and techniques, and the breaking of the German ENIGMA code, spelled the end of the early successes that Germany's U-boats enjoyed at the outset of WWII.
Escort vessels in time came to include Destroyers, Destroyer Escorts (Frigates), Escort Carriers for air cover (initial use of Merchant Carriers was an interim measure before EC's were introduced).
ASW technology and weapons, including Radar, Hedgehog/Squid ASW mortars, and the nighttime Leigh Light (a powerful spotlight aligned with Radar to illuminate U-boats during their final surface attack run), provided a significant improvement in kills and a proportionate decrease in losses.
This convergence of all ASW technology eventually led to an end-of-war 75% loss rate for the U-boats.
Britain blockaded Germany during World War 1, preventing food and materials from reaching the country. The Germans hoped to break the blockade by deploying submarines that would destroy British maritime power. Also, the submarines attacked cargo ships that brought supplies to Britain. In this way, Germany attempted to blockade Britain through the use of submarines. Also, submarines crushed British morale and made the war unpopular in the eyes of the public.
Europe became a smugglers paradise.
great britain
Because the British blockade prevented the United States from trading with Germany.
the continental system
Submarines.
Britain blockaded Germany during World War 1, preventing food and materials from reaching the country. The Germans hoped to break the blockade by deploying submarines that would destroy British maritime power. Also, the submarines attacked cargo ships that brought supplies to Britain. In this way, Germany attempted to blockade Britain through the use of submarines. Also, submarines crushed British morale and made the war unpopular in the eyes of the public.
In World War I, the Germans used submarines mainly to create a Submarine Blockade on Britain in an attempt to starve Britain out of the war. This blockade is similar to the Naval Blockade Britain used on Germany, but was not as effective, and Germany stopped halfway through the war. However, towards the end of the war when Germany was losing, they restarted the 'unrestricted submarine blockade', which accidentally sunk an American passenger ship. This angered America, leading to America's participation in the war, and the ultimate defeat of Germany.
Britain set up the blockade.
Europe became a smugglers paradise.
bombs
superman
The US, Russia, Great Britain, France, China and (recently) India have nuclear submarines.
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great britain
Because the British blockade prevented the United States from trading with Germany.
the continental system