It has been a year since the nation was stunned by the results of its most recent presidential election.

The candidate who won that bitter contest, Donald J. Trump, made a solemn vow to unify the nation, to bring us all together, to bind the wounds that tore us apart … blah, blah, blah.

That’s what is has been: so much blather.

One year after that historic election, we are as divided as ever. Maybe more so.

Has the president delivered on his pledge? Obviously not. What’s worse is to ask: Has the president really tried to deliver? The answer to that is just as obvious. No!

Trump continues to play strictly and exclusively to his base, the shrinking core of voters who stand with him no matter what. You see it in his immigration stance, his views on environmental protection, his hideous tolerance of bigotry (see his response to the Charlottesville riot), his “America first” rhetoric.

A president who took office with zero political capital to spend has acted as if he had it in spades. Trump continues to ignore the numbers, which tell us that he got nearly 3 million fewer votes than Hillary Clinton. Yes, he won the Electoral College — and was duly elected president.

However, the man who pledged to be the president for all Americans has gone out of his way since his election to be anything but what he promised to be.

This division didn’t start with Trump. Barack Obama also presided over a divided nation, as did George W. Bush before him, and Bill Clinton before that.

Still, when a president takes office promising explicitly to do something, one should expect him to follow suit.

Donald Trump has failed.