The USA will play defending champions Russia in the semi-finals of this year's Fed Cup.
The Americans swept both reverse singles matches against Germany on Monday after Sunday's play had been washed out in California.
Lindsay Davenport bounced back from a surprising loss on Saturday by dominating Germany's Julia Goerges 6-1 6-2 to give the United States a 2-1 lead in the tie.
Ashley Harkleroad then sealed the victory with a hard-earned 6-4 7-5 win over Sabine Lisicki, giving the Americans an insurmountable 3-1 lead in the best-of-five format.
Davenport and Lisa Raymond then won the dead doubles rubber, beating Anna-Lena Groenefeld and Tatjana Malek 6-2 6-0, to complete a 4-1 win.
Russia progressed with a 4-1 victory over Israel on Sunday.
Maria Sharapova made it two wins from two matches on her Fed Cup debut as she thrashed Shahar Peer 6-1 6-1 to put Russia into a 2-1 lead.
The defeat was Peer's first singles loss in the competition in 12 matches.
And Anna Chakvetadze, stepping in to replace Dinara Safina who had lost to Peer on Saturday, sealed the visitors' victory in the tie with a 6-4 6-2 triumph against Tzipi Obziler.
Russia, who also took the dead doubles rubber to complete a 4-1 win, will have home advantage for April's semi-final clash.
In Beijing, China secured a thrilling win over France - but not before the visitors had battled back from 2-0 to force a winner-takes-all doubles.
Virginie Razzano came from a set down to beat Na Li in the first of the reverse singles, before Nathalie Dechy levelled the tie at 2-2 with a 6-3 6-2 victory over Zi Yan.
However, Yan and Jie Zheng held their nerve in the doubles rubber, beating Dechy and Razzano 7-5 7-6 (7/5) to secure China's place in the semi-finals for the first time.
They will play Spain in the last four after they completed a shock victory over last season's runners-up Italy.
Two-up after the first day, Spain wrapped up victory when Ana Medina Garrigues beat Francesca Schiavone 6-4 6-1 in the first of the reverse singles in Naples.
Italy won the two remaining rubbers but it was a case of too little, too late.