If you ever wondered, why so many people in the US, but also worldwide like in my home country, Germany, get triggered by certain words, wordings and thoughts, and react accordingly, that sort of education began in the 1930s. Taken from the book "Deliberate Dumbing of America" by Charlotte Iserbyt, pages 24, 25: https://archive.org/details/DeliberateDumbingDownOfAmericaCharlotteIserbyt/page/n23/mode/2up