Effectively, 77,759 Electoral College votes in three states (WI/PA/MI) determined the Presidency.
In three key states, Trump won by less than 1%.
Let that sink in for a minute.
Republican presidential nominee Donald Trump won the United States presidential election by less than 1% in these three key Electoral College states:
Wisconsin: 22,748 votes, 0.7 of a percentage point
Pennsylvania: 44,307 votes, 0.7 of a percentage point
Michigan: 10,704 votes, 0.2 of a percentage point
This data comes from the Cook Political Report.
Hillary Clinton, before the Comey letter about the Clinton emails derived from the Weiner investigation was leaked, had leads of 3% or more in these states.
But after the Comey letter was leaked, the situation changed very much.
Unfortunately, since the election, Trump has behaved as if he won by some significant margin. He did not. He barely won the election through the Electoral College.