I am not, by temperament or habit, a political writer. For most of my career I have preferred to keep my head down, attend to my profession, and look after my family. But I am an American married to a first-generation Chinese immigrant, and many of the colleagues with whom I have spent my working life are themselves first-generation immigrants — from China, from India, from across Asia.Over three decades I have watched, at close range, what actually happens when a young person arrives in this country with a student visa, a graduate degree, and a willingness to outwork everyone…