It twer around in the 1960's when it actually first became blatant but it wasn't called that. The inventors of Political Correctness aka Cultural Marxism came here between WW1 & WW2 via Columbia University or another N.E. University who formed a mini version of The Frankfurt Institute. IIRC.
Hard Core Marxist like Herbert Marcuse who coined the phrase "Make love not war". These were thugs even Hitler booted out of Germany. They came and took over our universities and colleges while our fathers were fighting WW2. The WW2 field commanders like Patton, MacArthur etc were really the last of our great military minds as most of the rest since then being college educated have been brainwashed once the academy's were taken over as well. There are some exceptions of course.
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.
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/