Throughout the race for the White House, President-elect Donald Trump vowed to renegotiate trade deals to restore the manufacturing jobs that have all but vanished from the U.S. economy. In making this promise, he was not breaking new ground; President Barack Obama made similar assurances in his 2008 run for office. And much like his predecessor, Trump will face considerable challenges in fulfilling his pledge, constrained by the geopolitical, structural and institutional forces surrounding him. Without a doubt, the next president will usher in changes to U.S. economic and trade policies. But he will likely find a wide gap between theory and practice as he tries to deliver on many of his campaign promises....