Dersu Abolfathi, Ryan Finley and captain Kofi Sarkodie scored for the USA to move into first place in Hroup B and gain revenge for Czech victories over the Americans in the last two championship games.
On Monday, the USA tied Scotland, 1-1, in Larne. Parker Walsh scored the equalizer with five minutes left to play to earn the U-16s a point.
The USA closes out group play Wednesday against Ireland.
The USA has reached the final the past four consecutive years only to fall to Israel (1-2), Switzerland (3-4 on penalties), Czech Republic (0-1) and Czech Republic again (0-1).