The U.S. had an incredible first half and were very unlucky not to score multiple times. Its part of soccer that some nights just aren't going to be yours. After scoring the foot definitely came off the pedal. Given the fluky nature of the goal (Jamaican keeper had some tremendous first half saves but needed to do much better with that one) I think the U.S. team just decided that it wasn't their night and not to push their luck. Jamaica is a counter attack team, with lots of speed. With nothing to lose, they were going to flood forward any time we lost the ball. Defensively, Boca, Cherundolo and Cameron are not exactly fleet of foot, so its a bad matchup to allow the counter when preventable. So tactically, there was a lot of danger in pushing for a second goal and some limited up side.
Of course, the U.S. did not do a good job of maintaining midfield possession even once the foot came off. From that perspective they didn't execute a perfectly legitimate and defensible tactic very well, which is why the last 30 minutes looked as sloppy as it did. I'd give the U.S. a 6 out of 10 on the night overall. The first half was very well played and the U.S. was just unlucky, the second half not as much especially after they shifted from attacking to holding. That was down right dismal.