Britney Spears's teenage contestant, who has consistently topped our opinion polls throughout the season, collected 56.73% of votes in our final tally.
Fifth Harmony finished in second place with 28.28%, while Tate Stevens appealed to 14.99%.
Sonenclar's duet partner on Wednesday night's show LeAnn Rimes recently hit out at the "gossip and lies" surrounding her controversial performance.
TMZ quoted the country singer as implying that her own somewhat shaky performance was because she was "trying to help this 13-year-old girl who was having some trouble with the song".
Rimes insisted: "While I have not given any media outlet a quote, if you want one, here it is - 'It was an amazing opportunity to share this experience with Carly and I know I'll be watching for her to win tonight'."
The grand finale of The X Factor USA airs tonight (December 20) on Fox at 8/7c.
Photo gallery - X Factor USA finale part one:
Copyright: Fox Ray Mickshaw