2025?

Future historians are likely to identify the Bush administration’s rash invasion of Iraq in that year as the start of America's downfall. However, instead of the bloodshed that marked the end of so many past empires, with cities burning and civilians slaughtered, this twenty-first century imperial collapse could come relatively quietly through the invisible tendrils of economic collapse or cyberwarfare
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With just a few strokes of the pen and some terse announcements, the "Carter Doctrine," by which U.S. military power was to eternally protect the Persian Gulf, is laid to rest in 2025. All the elements that long assured the United States limitless supplies of low-cost oil from that region -- logistics, exchange rates, and naval power -- evaporate. At this point, the U.S. can still cover only an insignificant 12 percent of its energy needs from its nascent alternative energy industry, and remains dependent on imported oil for half of its energy consumption.

The oil shock that follows hits the country like a hurricane, sending prices to startling heights, making travel a staggeringly expensive proposition, putting real wages (which had long been declining) into freefall, and rendering non-competitive whatever American exports remained. With thermostats dropping, gas prices climbing through the roof, and dollars flowing overseas in return for costly oil, the American economy is paralyzed. With long-fraying alliances at an end and fiscal pressures mounting, U.S. military forces finally begin a staged withdrawal from their overseas bases.

Within a few years, the U.S. is functionally bankrupt and the clock is ticking toward midnight on the American Century

How America will collapse (by 2025)

Not a word in the article about climate change or peak oil... and even without them, this author paints a terrifying picture of America's future.

We need to have a clear picture of the gloomy future to prepare for it, to mitigate, adapt and survive.