A photographer tells her family's story about the dark side of an American dream
https://edition.cnn.com/style/article/diana-markosian-santa-barbara/index.html
As is often the case with history behind immigrants in those days, it's usually difficult for descendants to know the real reason why they immigrated.
Unlike these days, most of the reasons would be sad stories. We can guess why it must be a sad one. Who wants to dive into unknown world without sufficient information?
It means they had to manage to survive by throwing away their hometown.