Donald Trump won the presidency in part on the idea that the United States isn't getting its fair share of the global economic pie. The slogan "America First" more or less boils down to protectionism. Now, the Trumpian approach to global trade might feel like a departure from recent history. But the American industrial economy has its roots in protectionism, all the way back to Alexander Hamilton. We'll talk about it in the second installment of our series "Trade Off." Plus, the latest on SoundCloud's financial troubles, and we try to fit a wild week of news into five minutes of live radio.