1) Most big countries had submarine long before WW2. The first US sub was made in 1775, they had 72 submarines during WW1 and by the end of WW2 they had 228 of them.
2) Submarine are horrible against other submarine. In the history of the world, only 1 submarine was ever sunk by another submarine.
3) The allies developed a lot of technologies and tactics to hunt down German submarine, by 1943 the allies were sinking on average 20 U boats by month.
The effect of this was a drastic decrease in the amount of ships sunk by uboats. German Uboats sunk 6.2 million tons of allied ship in 1942, this number dropped to 2.5 million tons in 1944 and 773 thousand in 1944.
Submarine hunting was a relatively young discipline and it took some time for the allies to perfecting it.
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