Why we’re so polarized, why it will get worse, and no tl;dr

I want to add…. confirmation bias and selective perception from the online algorithms that act as news editor, that show you what you want to see, reaffirming your belief system
https://www.ted.com/talks/eli_pariser_beware_online_filter_bubbles

Increasing American political polarization is linked to television news deregulation following the federal Telecommunications Act of 1996, according to a Washington State University study.:
https://www.sciencedaily.com/releases/2015/09/150925093227.htm