Why American economy strong in world ?

Americas economy is crumbling, where have you been?

Because USA can print a green painted paper called US dollar.

but.....

The strongest capitalist superpower on the planet, capitalist America as a whole, not solely the evaporated US "sub-prime mortgage market", is transformed into the most "toxic asset" of the global system. Trotsky had predicted that America rising to world hegemony accumulates all the world contradictions as dynamite in its foundations. This dynamite, accumulated during a century of expansions and crises, of wars and revolutions, is now exploding changing the shape of the world in the 21st century..

America, the historically highest point of development of world capitalism, has been transformed into the center of world capitalism has become the center of its deepening crisis .

The collapse of the US sub-prime market in 2007 unleashed an international financial avalanche of bankruptcies and a global credit crunch, followed by a skyrocketing rise and then a dramatic fall in oil and commodity prices, but, above all, an unstoppable slide to a synchronized world economic downturn and recession.

The three decades-long finance capital globalization, after a series of shocks (1984, 1987, and 1997) ended into a catastrophe.

The outright failure of so-called ‘neo-liberalism', the economic dogma followed by almost every capitalist government, was epitomized by the dramatic actions taken urgently by the champions of privatizations, of Reaganomics and Thatcherism in the US and UK, themselves.

The process of increasing State rescue operations started from the nationalization of Northern Rock Bank in Britain in September 2007, of Bear Sterns, one of the ‘Big Four' investment banks in the United States, in March 2008, and then reached a decisive turning point that precipitated the September-October maelstrom: the nationalization of the twin giants Fanny Mae and Freddie Mac controlling the four fifths of the collapsing US mortgage market, in September 2008.

We are very happy, this deepening world crisis is unstoppable.We are right now fermenting unrest at scores of countries.The door for us , is open.

The American economy is comparitively strong because of the way it's been handled by politicians. For example, FDR's handling of WWII brought us out of the depression, and brought a time of prosperity for Americans, financially.

because america was born to be name for that.