It was the first loss of Arsenal's preseason, but Emery has taken plenty of positives from the preparations.
Emery said: "We are very happy - we finished the last match today, with the same players as before. You've seen different players, taking minutes and confidence.
"The result is not important but in the match today we showed a good level. When we needed young players, their performances were perfect.
"I'm very happy - the team worked well every day and the tour was perfect for us to be in the USA. We had a lot of fans in Los Angeles, Denver, Charlotte and here - and [to see them] for us is important."