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  In the United States, a new presidential administration always comes with policy shifts. But the dizzying speed with which President Donald Trump has issued executive orders and made sweeping federal changes during the first month of his second term has much of the world wondering what the long-term impacts of these changes might be, and what else is yet to come.  By threatening and instituting tariffs on longtime allies, moving to overhaul the US immigration system, promising "mass deportations" and empowering unelected billionaire Elon Musk to fire thousands of federal employees and potentially shutter entire agencies established by Congress, Trump has come out swinging in his second act. And while these policy shifts are likely to have far-reaching social, political and economic implications, experts say they will also have a huge impact on the US travel industry.   "From immigration rules to trade wars, these changes will make travel to and within the US a lot more complicated and way less appealing. It's like putting up a giant 'Do not enter' sign just as the world is getting back into full travel mode," said Kristin Winkaffe, founder of travel firm Winkaffe Global Travel. "If you make it harder for people to get visas, fewer people will come – it's that simple."