Who were the Ringwraiths?

[narfforc]

The desire for power corrupts, yes Sauron used men, but he didnt trust them. We do not know for certain that anyone taking the Ring would hand it over willingly to Sauron. If it entered their mind to become more than what they were, who knows what power the ring would exert. The Ring wanted to be reunited with its master, but in this it failed utterly, certainly none of its bearers ever entertained the idea of giving it to The Dark Lord. There were many times during the journey to Mordor that the Ring`s self-determination could have come into play, most notably, at the Stairs of Cirith Ungol, surely the Ring knew its fate. Sauron trusted none but the Nazgul, for they, through the power of One Ring were extensions of his own being, not even The Lord of the Nazgul would have had the power or the will to break the hold Sauron had on them, but men are unpredictable, treacherous and had unquenchable ambition. Though Melkor hated Men, he also feared them, for Iluvatar had bestowed strange gifts upon them, which those who had sang in The Ainulinale knew well. Although the Nazgul were originally men, they were something quite different by The War of the Ring, they were slaves of the Nine Rings and dependent on the power of The One Ring, and the Power that resided within The Great Ring was of the being of Sauron.