Teetering U.S. Stocks Add New Dimension to Global Selloff

Is the U.S. the World's Last Remaining Safe Haven?

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Currencies and stocks from Hong Kong to Johannesburg and London were already faltering. Then the U.S. joined in.

Stresses that have been building in global markets roared ashore in America on Thursday as the Standard & Poor’s 500 Index tumbled the most in 18 months and helped send the MSCI All-Country World Index to the lowest since January. Until now, the S&P 500 had been a source of stability amid China’s slowdown, Greece’s debt crisis and a plunge in emerging market currencies.