Davies turned provider in the second half when his corner found Clint Dempsey's powerful header.
Jimmy Bullard and Clint Dempsey worked effortlessly to turn the tide and push Fulham forward.
Huddlestone's excellent 20-yarder then made it 2-0, before Clint Dempsey bundled home against the run of play.
The goal stunned the U.S., which had just taken the lead on a volley from Clint Dempsey.
Elsewhere, Tottenham suffered a 2-1 loss at Norwich after Clint Dempsey failed to score a last minute penalty.
Fulham dominated the second half and almost levelled when Clint Dempsey's header was tipped over by Joe Hart.
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They were forced to repel late pressure and finished with 10 men after Essien's two-footed tackle on Clint Dempsey.
Clint Dempsey forced Hart into a diving save from Simon Davies's pull-back after Jimmy Bullard's long-range effort dipped wide.
Scoring the goal that gave the U.S. its first-ever victory over Italy was only Clint Dempsey's second-biggest achievement last week.
Angry glares shot across the Manchester United penalty area last Sunday while Tottenham Hotspur's Clint Dempsey streaked away from goal in celebration.
Gomes showed the more positive side of his game with a stunning one-handed diving save to keep out Clint Dempsey's long-range, left-foot drive.
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The hosts rarely threatened before Clint Dempsey was fouled by David Luiz in stoppage time, only for Cech to keep out the American's spot-kick.
Kyle Walker's long-range strike put the hosts back in front only for Clint Dempsey's late header to give the visitors a share of the spoils.
Fulham snatched a 1-0 win at cash-strapped Portsmouth thanks to a lucky goal from Bobby Zamora after Clint Dempsey's shot deflected in off the striker's back.
Andy Johnson had a header cleared off the line for Fulham, while Hull keeper Matt Duke saved from long range Paul Konchesky and Clint Dempsey strikes.
First US international Clint Dempsey struck the bar with a 30-yard strike and then Murphy repeated the trick with a curling shot from just outside the area.
Clint Dempsey made it two from 20-yards out in the second half and Bobby Zamora put Fulham in control with a shot into the right hand corner.
But moments later Clint Dempsey gave the home side a two goal cushion with a well taken 20-yard right foot shot that gave the keeper no chance.
England drew their opening game with the USA 1-1 when an awful error from goalkeeper Robert Green allowed Clint Dempsey to equalise Steven Gerrard's opening goal in Rustenburg.
Fulham trio Clint Dempsey, Carlos Bocanegra and Eddie Johnson are joined by Derby's Benny Feilhaber and Eddie Lewis, West Ham's Jonathan Spector, Everton's Tim Howard and Watford's Jay DeMerit.
Until that moment it had been a story of inspired saves from M'bolhi, poor American finishing and a lineman's error, which denied Clint Dempsey a goal in the first half.
Tottenham almost completely monopolised possession in the opening stages but a wild effort from Fulham striker Clint Dempsey aside, there was not a shot on goal in the first 24 minutes.
Zamora's replacement Clint Dempsey, back after three games on the sidelines, looked particularly sharp and had a penalty appeal turned down before linking well with Gera to carve out two openings.
"We've monitored him for a long time, before we were drawn against Roma in Europe, " said Hodgson, who has been keen to boost his strikeforce following injuries to Andy Johnson and Clint Dempsey.
But in the second half three critical substitutions from Spurs manager Andre Villas Boas and goals from American Clint Dempsey, Jermain Defoe and Gareth Bale in just 7 minutes turned the story upside down.
Zamora left the action on the hour, to be replaced by Clint Dempsey, after taking a heavy knock - a moment which brought a look of concern to the face of watching England manager Capello.
Clint Dempsey offered an effort that was little more than pot luck from 25 yards, but Green hopelessly allowed the ball to squeeze through him and roll agonisingly over the line as he tried to recover.
Zoltan Gera slid a pass into the Roma box for Clint Dempsey and he cut the ball back for Kamara, who was tripped by Marco Andreolli - the scorer of Roma's equaliser in the reverse fixture two weeks ago.
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