NATAL, Brazil— After Clint Dempsey's historic early goal, the United States spent more than an hour struggling to hold off wave after wave of Ghana attacks. It was no surprise when Ghana tied the game in the 82nd minute. Once again, the Black Stars — who had eliminated the Americans at the past two World Cups — were poised to ruin the tournament for the U.S. With two starters out with injuries, the U.S. barely threatened in the second half until a corner kick in the 86th minute.