The Dow Jones Industrial Average plunged more than 600 points, or more than 2.7 percent, Monday afternoon due to a turbulent mix of trade war fears and President Trump's repeated attacks on Amazon. The index rebounded a bit before markets closed, ending the day down 458 points. Shares of other tech companies, including Facebook, Netflix, and Google's Alphabet, followed Amazon as it dropped after Trump tweeted that "only fools, or worse, are saying that our money-losing Post Office makes money with Amazon." Trump also threatened the North American Free Trade Agreement over the weekend, while China on Monday responded to the White House's tariffs by imposing new taxes on U.S. imports like pork and fruits, moves that sent shockwaves through the markets.

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