Commentary Former Chicago mayor Rahm Emanuel was recently nominated by President Biden to become the U.S. ambassador to Japan. “I would proudly represent our nation with one of our most critical allies in one of the most critical geo-political regions,” Emanuel said. While it is nice to hear that Emanuel would like to do the job, his nomination is a perfect example of how American ambassadors should NOT be chosen. Virtually all countries have professional diplomatic services staffed by people who explicitly study international relations and diplomacy, who must pass difficult examinations in order to join the diplomatic service and who then must work 20 or 30 years in various diplomatic jobs, specialize in learning about and working in and with a particular country or countries, and become fluent in the languages of those countries before being named Ambassadors. An excellent example is the Ambassador of China to Japan. Kong …