Here's how US trade policy has changed over the last century

President Trump made the debate over free trade one of the central topics of his campaign, and since his election has continued to argue that the US is in a "very unfair" position when it comes to trade.
He originally focused his ire on China and Mexico, but also recently pointed to Canada and South Korea.
But the debate over free trade versus protectionism long predates the current administration.
In a recent report to clients, a Goldman Sachs equity research team led by&nbs