How, when, and why has the United States now arrived at the brink of a veritable civil war?

Almost every cultural and social institution — universities, the public schools, the NFL, the Oscars, the Tonys, the Grammys, late-night television, public restaurants, coffee shops, movies, TV, stand-up comedy — has been not just politicized but also weaponized.

Donald Trump's election was not so much a catalyst for the divide as a manifestation and amplification of the existing schism.