Just like in any sport, but American football in particular, the USA got complacent and quit attacking on offense and it almost cost them. I didn't see it all clearly as I was watching from my office while I was working. But it looked like in the early 2nd period until about the 78-minute mark they were content to play D/keep away and you could tell. Mexico had way more shots on goal and I think I heard the announcers say it was their 1st corner kick all game at about that point.
They turned it back up offensively then and it showed. I'm a soccer neophyte so I may be all wet, but that's what I saw.
Chad
PS……………after knowing absolute nothing about soccer until my kids started about 5 years back, I absolutely love it.