Agreed. It makes me think they might have used that selection criteria specifically in order to provide an out-sized visualization about the impact of immigrati

Agreed. It makes me think they might have used that selection criteria specifically in order to provide an out-sized visualization about the impact of immigration on the founding of US companies. Seeing the actual numbers on the the founder-level would be more informative and probably also let me shed my doubts about whether or not those who created the study were doing it a biased manner. I also think it's weird that Amazon was counted as "child of an immigrant". He was adopted as a child by his immigrant step-father after his mother's marriage - but he definitely would have been in America regardless of immigration policy...