Thomas Muller's second-half strike was the difference between the sides as die Nationalelf secured a spot in the second round, finishing ahead of the second-placed USA in Group G.
Low insisted that he was satisfied with the cohesion his side showed over the course of the game but felt they needed to be more ruthless in attack game uring the gin Recife.
"We played with good organisation," the 54-year-old told ZDF.
"Until the closing minutes we did not allow the USA any chances. We missed some chances to play the killer pass in the final third. If we would have done that we could have scored two, three more goals.
"I wanted to give Sami Khedira a break. Lukas Podolski was willing, but couldn't really adapt to the game.
"Thomas Muller has a feeling to know where he must run to [to score a goal]. His wound is closed, he is tough," he added, referring to the head injury the goalscorer sustained against Ghana.
The Germany boss was also quick to praise the work of Jurgen Klinsmann in guiding the unfancied USA out of arguably the toughest group of the tournament.
"In the middle, the Americans were very strong in terms of heading," Low added, reflecting on the Stars and Stripes.
"It is nice for us that Jurgen Klinsmann also made it into the last 16."