The American political system has been thrown into chaos. Who would have predicted the success that Donald Trump had in 2016? But look under the surface and the answer is obvious.

Americans are deeply worried their economic future. They worry that other countries, like Germany, Japan, and China are gaining, or have passed us, while the American middle class falls farther behind. Why are those countries winning?

Welcome to the world of global specialization. Today, countries and regions of the world are focusing and dominating in certain industry sectors like...