I see that Dr.Bob says that “krap” and “ka” were introduced by Plaek Phibunsonkram. I must confess that this statement came as a surprise to me.
He didn't invent it but he did make it universal.
Originally Posted by EMB
I would like to understand what Plaek Phibunsongkram exactly did
Search up on Plaek's "Cultural Mandates", fascinating stuff and the foundation of much of modern Thailand, particularly the parts that people think are ancient Thailand /Siam.