Hi Paul,
Thank you for this important question! Yes the book offers many practical tips that can be used to bridge this divide to a degree. I'm not claiming it will always work or offering any guarantees, but I have collected a lot of evidence that will surprise you. Here are a few reflections on this issue in no particular order:
1) The left/right divide in the US is regularly misrepresented and amplified by the media. The book has a chapter on peace education that explains this dynamic but in a nutshell if you pick up on points of difference between people and ask them to talk about those, you can push those people further apart. But it's also possible to pick up on points of commonality, and the truth is, you have a TON in common with people you totally disagree with on some points. For instance there are all kinds of conjectures thrown out there in the media about different segments of society think or why they do what they do, but this is regularly based on imaginary caricatures of people rather than strong evidence. Many other articles will try to find the "one trait" that explains some complex situation - for instance support for Trump - as though there can be just one true reason for anything (spoiler, even if they find one trait that has some statically predictive validity, it's hardly representing the whole picture of what's going on! e.g.
https://www.politico.com/magazine/story/2019/02/16/donald-trump-support-2020-oostburg-wisconsin-chevy-chase-maryland-225161,
https://www.politico.com/magazine/story/2016/01/donald-trump-2016-authoritarian-213533)
2) Various studies find that folks in the US don't understand "the other side" so well, and drastically over-estimate how different they are. So the divide may be more about identity than about issues! For instance Democrats said 52% of Republicans would agreed with the statement: “Properly controlled immigration can be good for America.” In fact, 85% of Republicans agreed. The same perception gap exists when asking Republicans about what Democrats believe.
https://perceptiongap.us. Chapter 2 of the book looks at othering (the process of seeing someone as an "other" rather than part of your group.) It's full of tips that can help when interacting with someone who you
experience as being from another political party (which too often seems to be as strong of a divider in the US as if they were from another planet!)
3) There are experts hired by politicians who are very good at finding words and phrases that push emotional triggers. These words don't trigger everyone in the same way though, so they contribute to polarizing us between the people who are strongly supportive and strongly opposed. I've written a short blog post about this offering an example from George Lakoff: the term “tax relief.”
https://www.psychologytoday.com/us/blog/are-we-done-fighting/201905/how-language-can-polarize-us. The key point is that we may not be that far apart on key issues, but what exact words those issues are conveyed in makes a BIG difference.
Similarly studies from the US, UK, and Germany found that even on supposedly very polarizing issues like gun control, immigration, and policing, folks change their responses dramatically depending on how the information is framed
https://psmag.com/news/the-grand-old-party-longs-for-the-good-old-days. So we need to learn to speak in terms that the other side cares about, understanding that they may value things differently from us. And we need to be able to translate what they're saying from their terms into ours to better hear them.
4) We're heavily influenced by polarizing messages from elites (politicians, news media pundits, etc.)
https://www.sciencedirect.com/science/article/pii/S0261379418301975 so a major shift could happen simply by having a small number of people tone down their rhetoric and look too for points of commonality. Not saying that's easy or even likely, but it's not impossible. I think the same about online information. A handful of companies control the information accessed and shared by billions of people. Right now platforms like YouTube, Twitter, and
Facebook are designed to maximize how much time we'll spend on them and how many ads we'll see. They're also designed to collect endless data about us, which can be used for psychological profiling and targeted messaging/manipulation. That's all quite disturbing. I believe it is contributing to shifting people's views - for instance fueling the spread of hateful conspiracy theories. Chapters 6 and 7 look at that. But this also means that just a few decisions by a few companies could drastically improve the situation if they built their platforms to stop promoting hateful clickbait.
5) Lots of groups are working on countering polarization and building bridges in the US. Here are just a few:
• https://greatergood.berkeley.edu/topic/bridging_differences
• https://allianceforpeacebuilding.org/resources-for-peacebuilders/domestic-peacebuilding/
• http://ac4.ei.columbia.edu
• https://openmindplatform.org
• https://heterodoxacademy.org
• http://www.civilpolitics.org
• http://www.reckonings.show
• https://www.moreincommon.com
• https://www.solutionsjournalism.org
• http://www.thepeacemakerspodcast.com
• https://www.nifi.org
• https://narrative4.com
6) Finally the importance of communication skills can't be overstated and the book has a chapter and exercises on that.