World number 24 CoCo Vandeweghe was the heroine for the Americans, winning her singles match on Sunday before returning a couple of hours later to team up with Bethanie Mattek-Sands for an emphatic 6-2 6-3 win over Kristyna Pliskova and Katerina Siniakova.
Vandeweghe appropriately clinched the victory on serve, finishing the weekend a perfect 3-0 and sending the Americans through to the final for the first time since 2010.
The loss by the second-string Czech team, missing several top players, ended any hopes of a fourth title for the three-time defending champions.
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In Minsk, Belarus won both Sunday singles to take an insurmountable 3-1 lead against Switzerland before the visitors won the dead doubles rubber.
Aryna Sabalenka sent Belarus into the final when she beat Viktorija Golubic 6-3 2-6 6-4, after team mate Aliaksandra Sasnovich had beaten Timea Bacsinszky 6-2 7-6(2).
The U.S. has not won the Fed Cup since 2000, while it will be the first final for Belarus, who will host the Nov. 11-12 decider.
(Reporting by Andrew Both in Cary, North Carolina; Editing by Clare Fallon)
