The S&P 500 and Dow Jones indexes experienced a higher open on Thursday, boosted by Boeing shares as the plane-maker resumed production of its 737 MAX jets.
However, simmering tension between the United States and China kept investors on edge.
The S&P 500, or simply the S&P, is a stock market index that measures the stock performance of 500 large companies listed on stock exchanges in the U.S.
The Dow Jones Industrial Average rose 149.09 points (0.58 per cent) at the open to 25,697.36, and the S&P opened higher by 10.48 points (0.35 per cent) at 3,046.61.
But the Nasdaq Composite dropped 19.36 points (0.21 per cent) to 9,392.99 at the opening bell.
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