1946- 2016 2017- 2017-2021 american-politics bipartisanship civilsociety courtesy cultural-differences democracy democratic-process divisive-politics donald election general ideological-divide law media-influence newyorktimesbestseller newyorktimesreviewed nyt:combined-print-and-e-book-nonfiction=2020-02-16 partisan partisanship polarization polarization(socialsciences) political-conflict political-ideologies political-parties political-polarization political-psychology politicalculture politicalparticipation politics politicsandgovernment presidents representativegovernmentandrepresentation rightandleft(politicalscience) social-divisions trump unitedstates us-politics voting-behavior