Trump won because democrats underestimated him and the undercurrent of frustration (right or wrong) of white America.
What about Trump's gains with black and Hispanic Americans? Trump won roughly the same percentage of the white vote as Romney did 4 years earlier. Trump did do better with males among his predecessors.
This is my problem with the media. They are arrogant, lazy and biased. It is so easy to blame Trump's victory on "angry white voters" when the numbers really don't back it up. Because they say it, and say it repeatedly, these media myths take hold.
Behind Trump’s victory: Divisions by race, gender, education
Donald Trump's win followed a campaign that revealed deep divisions that were as wide and in some cases wider than in previous elections.
www.pewresearch.org
"Trump won white voters by a margin almost identical to that of Mitt Romney,"