I'm going to do a Nostradamus here, and try to predict what is going to happen in the next 120 years if things go on this way, I've worded it rather radically, but I'm not trying to start a flamewar, just trying to put it directly

Within 20 years : Regardless of which party gets into power, I predict an increase in secularism and religious fervour. I see an increase in religion and race related violence.
Within 50 years : Oil consumption and water demand at an all-time high, people suddenly start realising that the original Oil-supply quotes were assuming that the population would not increase by over 50% in the next 20 years. Energy demand will become a matter of War once again, as areas of America tended by Oil-based generators suffer from blackouts. Hydrogen and Solar power which was left far too late, can only provide a tiny fraction of the National Grid, and generators cannot be replaced fast enough due to economy problems caused by the Oil Crisis.
Within 100 years : Some Southern states, seeing themselves as 'Christian States' start to demand a church-led leadership which would replace a Washington-Based leadership, effectively expressing a wish to become like the Vatican, a country of their own accord. This will not be granted, but the cracks will start to show by now.
Within 130 years, the massive debt from obtaining Oil and other Energy finally backlashes and the economy collapses, thousands die from starvation and violence and America is left with a humanitarian crisis.
If you think I am overplaying this, read the ending of just about every major empire, corruption seeps in at the top, Wars are fought for land/gold whatever the local demand is at the time. Eventually as people turn more and more to religion to fulfill themselves, in many cases certain 'home' states will start to cause trouble, this is usually the first sign that things are terribly wrong. As the cycle of 'gain over relations' continues, the empire eventually collapses in on itself as it finds out it theres nothing more it can take and can no longer afford to take anything else.
From Rome to Russia, I think pretty much every one of them has gone the same way

I hope it doesn't to be honest, it would be a terrible disaster, but unless the people in power can see beyond their own bank accounts, I can honestly see things starting to go this way.
