States that President Barack Obama won in 2008 and 2012 tilted to Trump because he spoke about relative hardship in the rustbelt. When push came to shove, their vote made all the difference.
One observer suggested Trump's voting base takes the former reality star seriously but not literally. When Trump talked about building a wall on the Mexican border, his supporters heard a message about immigrants taking American jobs. When he warned Apple to stop making iPhones in China, they felt he meant business about putting a spoke in free trade.
Trump's slogan - "Make America Great Again" - resonated with the forgotten people because their jobs were threatened by globalisation.
There is clearly a parallel with the Brexit vote in Britain and with opposition to the Trans Pacific Partnership, which now seems finished. In the US, as in the UK and Europe, there is a deep mood of unease capable of confounding expectations and turning the world upside down. Politicians everywhere ignore it at their peril.
How the result translates into policy is uncharted territory, though the people who put Trump in office will expect payback.
His unexpected success stirred protests in US cities yesterday, but notes of graciousness too. Obama pledged a smooth transition for the 45th US president. A disappointed Clinton told her backers they owed Trump an "open mind".
New Zealand, a trading nation, will be affected if Trump runs true to his protectionist form.
With control of the Senate and Congress, the President-elect commands significant power. How he wields it will only be clear when he enters the Oval Office.
As with much of his presidential campaign, Trump again appears to be asking the American people to trust him and wait and see.