At least in great part, he won because a majority of people in this country were tired of being dismissed and trampled on.
Another facet of the reason for his win is that news media personalities' hubris caused them to not only believe their own lies but they could not fathom that the American people had been paying attention and learned not to care what came from their foolish mouths.
We have to add the fact that he chose a successful governor as his running mate, showing that he wanted good advice, and then responded to complaints against him by toning down his blustery attitude and learning to present himself as more presidential, more respectful of the office he was seeking.
He continued to gain electoral and popular votes even after he became the president-elect because he seems to have listened to the USA's people and agreed with them. His choices for the future have yet to be seen so let's not forget to pray for him to continue being teachable, to remember why he was elected, and to remember the importance of all the decisions he will make.