I was talking about collective trauma which OP was citing, though their initial term is collective PTSD.
Why would you use n-gram and not journal search engine like Google Scholar. There seems to be an engagement in the concept of collective PTSD since about 2007.
Is this an area of research or practice for you? It is not mine.
Uncle Iroh
I know he’s a genocidal war criminal, but he lost his son and traveled a long path of tea and paisho eventually cherishing and mentoring his nephew.
Uncle Ruckus
He’s a simple man, tryin’ to make his way in the world. Life’s dealt him a tough hand, but he played it the best he could. He worked hard, respected the values he was raised with, and tries to bring a bit of order to this chaotic world. He ma be rough around the edges and may not make words so good, but he believes in tough love and speaking his mind.