"Clearly this is the biggest sign yet that the U.S. is catching the slowdown that is well underway in Europe and China," said Paul Dales, senior U.S. economist at Capital Economics in London.
"Manufacturing is gearing down," said Neil Dutta, head of U.S. economics at Renaissance Macro Research LLC in New York. "It's consistent with the idea that the uncertainty is weighing on businesses. Europe is taking a bite out of the export sector."