Stanford's Kelly O'Hara also tallied a first-half goal for the USA, which will continue group play on Friday against Cuba, a 7-0 loser to host Mexico.
"I was proud of our effort today," said U.S. coach Tony DiCicco. "I think they had some nerves going into the game as there are always high expectations for a U.S. team. Trinidad & Tobago really defended well, they have great athleticism and they didn't make it easy for us to get scoring opportunities."
June 18 in Puebla
USA 4 Mexico 0. Goals: Enyeart 9, 30, 76, O'Hara 32.
USA -- Naeher, Dallstream, Fowlkes, Marshall, Klingenberg, Edwards, Nogueira, Winters (DiMartino, 72), Enyeart, Morgan (Leroux, 60), O'Hara (Washington, 58).
Trinidad & Tobago -- Forbes, Blair, Russell, Cunningham, Olliveirre, Mascall, Cummings, Noel (Warrick 68), Cordnet (Walker, 14), Edwards (Charles 80), Rodney
USA 4 Trinidad & Tobago 0
Mexico 7 Cuba 0
Canada 2 Nicaragua 0
Costa Rica 3 Jamaica 1