Yes, they did.
USSR; US; UK; Germany & Japan.
The early SS and the newer GATO Class diesel submarines.
Yes, submarines were used by the Confederate Navy in the US Civil War.
52 US submarines were lost in WW2. This was about 1 in every 5 submarines that the US had in WW2
Sonar
by avoiding sinking of US vessels by German submarines............... but, after Japan bombed Pearl Harbor, Germany declared was on the U.S.
The US and Japan were the other primary submarine users of that period, so no, Germans weren't the only ones using submarines during WW2.
The US helped France in world war 1 with submarines in the Atlantic.
326
The Allies, including Great Britain, USA, Russia and Italy all had submarines during WW1. In general they were not nearly as advanced or successful as the German U-boats.
Horses, trains, boats, ships, submarines, hot air balloons, carts, wagons.
Like Great Britain, Japan is an Island Empire. Germany tried to starve Britain with her submarines (U-Boats). The US did starve Japan with it's submarines (the silent service, US Navy).