Is This Economic Crisis a Key Turning Point in History?

Like other observers, Niall Ferguson says maybe:

Could this be one of those great turning points in history, when the balance of power tilts decisively away from an established power and towards a rising challenger? It is possible. Financial crises often accelerate the gradual shifting of the geopolitical tectonic plates; they are to history what earthquakes are to geology.

It was inflation that undermined the foundations of Habsburg power and opened the way for the Dutch Republic. It was the disastrous Mississippi Bubble of 1718-19 that fatally weakened ancien régime France, while Britain survived the contemporaneous South Sea Bubble with its fiscal system intact. For most of the nineteenth century, financial crises in the United States had only marginal effects on the City of London. By 1907, however, a Wall Street crash could send a shockwave across the entire British Empire, a harbinger of a new era of American power.

Something similar may be happening as a consequence of the American financial crisis that began nearly two years ago. The flapping of a butterfly's wings may trigger a hurricane in the Home Counties; in much the same way, a crisis in the market for subprime mortgages could signal the waning of US hegemony and the advent of a Chinese century.