retrospect looks horrific and people have now apologized for how that was played out. but to me it symbolized the divisions that were really taking hold, politically and society wide. as you were researching this book, is there one moment that you think is underappreciated, that really exposed our divisions and how badly they were? >> yeah, you know, it is a great point, sam, if you think about it, the fear after 9/11 was in its own way a gateway drug to this larger form of divisive ideology for the reason you describe. there were political opportunists in the years afterward who said i'm going to take what say legitimate fear that people have of terrorism and i'm going to use it to incite a broader sense of division, somebody whose name is largely lost to history, tom tancredo, somebody i mention in the book, a republican congressman from colorado, he was one of the people who made that pivot, the move from fear of terrorism to fear of muslims and ultimately to fear of immigration itself. he was somebody who first said, you know, i'm introducing what