Midfielder Steve Pontrello scored five goals, including three straight to open the second half as the Americans built a 9-5 lead 5:46 into the third quarter.
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The Americans (4-2) will play Canada (5-0), a 15-4 winner over England in Thursday's first semifinal, for the world title Saturday.
Team USA has won all six gold medals contested since sanctioned U-19 international play began in 1988. Canada beat the U.S., 15-13, in overtime Saturday in pool play.
Major League Lacrosse: The Bayhawks waived midfielder Chris Hunt (Severna Park) from the practice squad, put defenseman Mike Simon (Stevenson, Fallston) on the practice squad and activated midfielder John Austin from the collegiate inactive list.
From Sun staff reports