The ring was made by Sauron, yes, but that doesn't mean that Sauron didn't take advantage of Mount Doom's location and steal some power from the depths of Middle-Earth itself. Along with the power of Middle-Earth, a portion of Morgoth's ring would have "hitched a ride" and possibly strengthened the ring as well.
Someone else has commented that in one of his letters, Tolkien specifically stated that Sauron himself could not destroy the ring or even contemplate it's destruction. This seems to say that the ring held a great deal of power over Sauron and that the reason it would listen to him is because he was already tainted and had a connection to it. For all we know, the ring could have very well left Sauron one day in favor of a Vala, if he were ever to come before one, or Morgoth when he escaped the Doors of Night.
The ring may have been useable by Sauron, but I believe that it was ultimately the master. Debate over this if you will.
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"And forth went Morgoth, and he was halted by the elves. Then went Sauron, who was stopped by a dog and then aged men. Finally, there came the Witch-King, who destroyed Arnor, but nobody seems to remember that."
-A History of Villains
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