England fans have had many years of getting to know when their team is playing badly.
One thing that tends to evolve is the chanting. We have long had (to the tune of the Plastic Ono band's Give Peace a Chance)...."all we are say-ing, is give us a goal".
Next, it will be something like "Eng-er-land, Eng-er-land, we are not as **** as you think we are".
At the moment, USA fans in bars probably do not know the rules of football, let alone the nuances, so the only "connection" they feel is the patriotic bit.
Give it five, six or seven years and there will be many young adults around who actually played and enjoyed football throughout their school days, and will be more able to interpret what is going on in the match.
My prediction is that the USA will be one of the top five footballing nations within the next ten years. Money, can-do attitude, population, ambition... it will all click into gear sooner, rather than later.
Finally, the USA are actually playing the rest of the world at something, and not far away from winning.