By CCN: The Dow and broader U.S. stock market gave back gains Tuesday, as the threat of a trade-war escalation with China prompted Citigroup to slash its iPhone sales projections by half. Shares of Apple Inc. (AAPL) were little changed at the start of the holiday-shortened week, but that could soon change if Chinese residents shift their smartphone preferences. Dow Rally Vanishes; S&P 500, Nasdaq Follow All of Wall Street’s major indexes pivoted lower Tuesday afternoon, which reflected a tepid pre-market for Dow futures. The Dow Jones Industrial Average initially rose by as much as 132 points before giving back

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