My question now... Can USA lose to Germany and go through? Sure we can! It's prolly gonna come down to a tie on points with either Portugal or Ghana. Tiebreakers incoming.... gonna come down to goal differential. ACK gonna be tight. Right now USA is +1, Ghana -1, and POR -4. But all of that could change drastically.
Portugal is not really good atm, and Ghana will play for the win. And even if Portugal manages to win against Ghana, the US have to lose like 3-0 or 4-0 to Germany cause as you said the goal differencial at the moment advantages the US.