They were; the technology to make them a lethal threat just didn't exist until the late 1800's.
Sonar was used to detect and hunt submarines in WW2
The submarines were either called "submarines" or "U-boats." The German submarine was called the "U-boat"
There are different answers to that but the most common one is that the USN had 288 submarines in WW2
Germany must surrender its submarines and weapons
One of our Submarines was created in 1982.
Oilers then merchantmen.
There were subs in the 19th century, but they were really a part of naval warfare from World War One to the end of the Cold War. If large scale war breaks out in the near future, expect submarines to be a huge factor on the ocean front.
Only one US submarine sank in World War One.
One successful tactic Germany used in World War One was submarine warfare. It lacked the navy Great Britain had. Building submarines was the fastest and least expensive way to have a military presence in the seas and oceans.
yes and they were used frequently Yes. There are some examples on public display. One is located next to the battleship USS Alabama at Mobile, AL.
Perhaps you're thinking of the liner Lusitania which was sunk by German submarines during World War One.
ONE