The USA secured a record 32nd Davis Cup title after Bob and Mike Bryan's doubles win gave them an unbeatable 3-0 lead over Russia in the final.
The brothers defeated Igor Andreev and Nikolay Davydenko 7-6 (7-4) 6-4 6-2 in front of a noisy home crowd at Portland's Memorial Coliseum.
James Blake and Andy Roddick had given the home side a 2-0 lead after Friday's opening singles ties.
It was the USA's first Davis Cup final win for 12 years.
The Bryans, winners of five Grand Slam titles together, had lost just one doubles match in 13 Davis Cup appearances going into Saturday's game.
606: DEBATE
Although they squandered an early break point off Andreev's serve in the opening set, they won the tie-break 7-4 on an Andreev double-fault after coming from 3-1 down.
They then broke Davydenko in the first game of the second set and held serve to establish a commanding two-set advantage.
There was to be no way back for the Russians with Davydenko broken twice in the third set in the third and seventh games and the Americans sealed the win with a determined volley.
"Since 2003 our mission was to win the Davis Cup but I never imagined we would win it in front of a home crowd," said a delighted Bob Bryan.
"We knew the tie-break at the end of the first set would be crucial because it is hard to break on this court.
"We knew the tie-break at the end of the first set would be crucial "
"But we can die happy - our careers are set."
Roddick, who set the Americans on their way with singles victory on Friday, said the win was as sweet as winning the US Open.
"It wasn't really a seven-, eight-year process to win the US Open," he said.
"All of a sudden I was on tour and it happened before I knew it.
"But this has been a journey. Like Patrick [McEnroe, team captain] said, we've been to some places.
"Winning the US Open, trying to compete for Slams, you're playing for a lot of selfish reasons.
"To come in here and to share this with these guys, and to have developed the friendships and everything that goes along with it, the laughs and the tears, it's just amazing."
Friday 30 November - opening singles:
Andy Roddick bt Dmitry Tursunov 6-4 6-4 6-2
James Blake bt Mikhail Youzhny 6-3 7-6 (7-4) 6-7 (3-7) 7-6 (7-3)
Saturday, 1 December - doubles
Bob Bryan/Mike Bryan bt Igor Andreev/Nikolay Davydenko 7-6 6-4 6-2
Sunday 2 December - reverse singles:
Roddick v Youzhny
Blake v Tursunov
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