Eddie Lewis scored America's second on the hour mark to seal a deserved victory for the home side.
USA: Rimando, Suarez (Petke, 78), Brown, Agoos, Vanney, Mulrooney, Stewart (Lagos, 83), Convey (Ching, 75), Lewis, Donovan, Kirovski (Eskandarian, 89).
Wales: P Jones (Ward, 46), M Jones (sent-off 48), Vaughan, Melville, Williams, Pembridge (Robinson, 79), Oster (Pipe, 70), Johnson, Davies, Koumas, Taylor.