The 18-hour Vietnam retrospective unspooling on PBS is filled with powerful words and images…Curiously, it is a piece of the past that is not in the documentary that is, for me, both a chilling forewarning of what is to come and a significant lesson for leaders who are today faced with a dilemma out of which there is no clear path. I doubt Donald Trump has any profound thoughts on the Vietnam War or any interest in its teachings, but his advisers would do well to read it, Jeff Greenfield writes in Politico.

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