This article really lays it out: it's not a question of whether the US will lose its previously unchallenged glbal power, but just how precipitous and wrenching the decline will be. In addition to the snippets quoted below, the article uses the National Intelligence Council's own futuristic methodology to suggest four realistic scenarios for how, whether with a bang or a whimper, US global power could reach its end in the 2020s (along with four accompanying assessments of just where we are today). The future scenarios include: economic decline, oil shock, military misadventure, and World War III. While these are hardly the only possibilities when it comes to American decline or even collapse, they offer a window into an onrushing future."
http://www.thenation.com/article/156851/decline-and-fall-american-empireAvailable economic, educational, and military data indicate that, when it comes to US global power, negative trends will aggregate rapidly by 2020 and are likely to reach a critical mass no later than 2030. The American Century, proclaimed so triumphantly at the start of World War II, will be tattered and fading by 2025, its eighth decade, and could be history by 2030.
Snippets:
Significantly, in 2008, the US National Intelligence Council admitted for the first time that America's global power was indeed on a declining trajectory. In one of its periodic futuristic reports, Global Trends 2025, the Council cited “the transfer of global wealth and economic power now under way, roughly from West to East" and "without precedent in modern history,” as the primary factor in the decline of the “United States' relative strength—even in the military realm.” Like many in Washington, however, the Council’s analysts anticipated a very long, very soft landing for American global preeminence, and harbored the hope that somehow the US would long “retain unique military capabilities… to project military power globally” for decades to come.
Wrapped in imperial hubris, like Whitehall or Quai d'Orsay before it, the White House still seems to imagine that American decline will be gradual, gentle, and partial. In his State of the Union address last January, President Obama offered the reassurance that “I do not accept second place for the United States of America.” A few days later, Vice President Biden ridiculed the very idea that “we are destined to fulfill
Kennedy's prophecy that we are going to be a great nation that has failed because we lost control of our economy and overextended.” Similarly, writing in the November issue of the establishment journal Foreign Affairs, neo-liberal foreign policy guru Joseph Nye waved away talk of China's economic and military rise, dismissing “misleading metaphors of organic decline” and denying that any deterioration in US global power was underway.
Ordinary Americans, watching their jobs head overseas, have a more realistic view than their cosseted leaders. An opinion poll in August 2010 found that 65% of Americans believed the country was now “in a state of decline.” Already, Australia and Turkey, traditional US military allies, are using their American-manufactured weapons for joint air and naval maneuvers with China. Already, America's closest economic partners are backing away from Washington's opposition to China's rigged currency rates. As the president flew back from his Asian tour last month, a gloomy New York Times headline summed the moment up this way: “Obama's Economic View Is Rejected on World Stage, China, Britain and Germany Challenge US, Trade Talks With Seoul Fail, Too.”