You've read post-election analysis by the discredited corporate pundits who thought Hillary Clinton was a shoo-in. Since I saw Donald Trump's "upset" coming, my take on what happened and why may be of more interest.
As with any large-scale disaster, the ascent of a spectacularly unqualified buffoon to the most powerful political office on Earth came about as the result of numerous system failures and operator errors. Here's a bird's-eye view of what went wrong.