If you can find it Bill Lind’s essay “The origins of Political Correctness” gives a real good detail in brief form of how it happened.
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http://www.academia.org/the-origins-of-political-correctness/
Thanks. It is a very revealing piece of work. I used to watch him back in the mid 90’s when he and Brad Keena had a TV show called The Next Revolution. It was on a Conservative based TV network started up by Paul Weyrich. Lind was predicting back them many of the things happening today.