MONCTON — Logan Cooley had three goals and an assist and Ryan Ufko set up five goals to lead the Americans into the semifinals.
Red Savage and Cutter Gauthier added two goals apiece for the U.S., which outshot Germany 41-22.
Jimmy Snuggerud, Blake Jackson, Kenny Connors and Dylan Duke rounded out the scoring for the U.S.
Luka Hauf scored a late goal for Germany.