They lost one game they should have won in Copa America. They lost to Panama because Tim Weah punched a Panama player in the mouth in the 20th minutes and they played with 10 for over an hour and lost.
Most soccer players from the USA come from privileged club teams growing up. Along with 99% of the best athletes in the USA that just go into other sports it makes it hard to win against countries that love the sport and are hungry.