What do Kenneth Pomeranz and Steven Topik mean by their provocative chapter title “People Patterns: Was the Real America Sichuan”?

What do Kenneth Pomeranz and Steven Topik mean by their provocative chapter title “People Patterns: Was the Real America Sichuan”? Why compare Sichuan with the America(s)? What evidence do they show for their argument about the Chinese migration? What is the significance of comparing Chinese and European migration statistics and trends?

In 250-300 words, answer as many questions as possible and cite the reading whenever needed. Keep in mind that these questions are interconnected and should be thought about as a whole.