Here’s a Thanksgiving week healing salve we all need after that ghastly presidential knock-down campaign: a reminder that we Americans invented the cultural melting-pot and shouldn’t discard it yet. We remain the e pluribus unum whose that every nation to which every other nation aspires.

It’s a silly little story, actually, about an Arizona grandmother whose kitchen skills likely are better than her mastery of social media.

The story began last week when Jamal Hinton, a 17-year-old from Phoenix, got a group text reminding him to come to Thanksgiving dinner. Not recognizing the number, Jamal texted back, “Who is this?” and got a reply: “Your grandma.”

“I actually did think it was my grandma,” Jamal told The Arizona Republic, so he asked the texter to send him a photo.

She was a grandma, all right — just not his grandma. Shes white and Jamal is black — as the woman discovered when Jamal sent her back a selfie and the text message: “You not my grandma. Can I still get a plate tho?”

“Grandma,” who has been identified only as a woman named Wanda from Mesa, sent back a heart-touching answer.

“Of course you can, that’s what grandmas do ... feed everyone.”

The story was confirmed by Wanda’s grandson, Brandon Burgoyne, 24, of Mesa, the intended recipient of grandma’s texted invitation.

So here’s the kicker: Jamal and his parents will be sitting at Wanda’s table this Thursday, celebrating Thanksgiving with newfound friends of completely random choice.

And a week later, millions of people got to share in their joy, generosity and willingness to make friendship out of a wrong number. Jamal shared the text exchange on Twitter along with his summation: “Somebody grandma is coming in clutch this year!! Ayee!!!”

Well said, young man.

And the sweetest gesture, grandma. Exemplary gestures by both of you to reminds all of us that despite all our differences and divisions, we Americans have much to be grateful for — especially each other.

This Thanksgiving week, let’s dwell on the thought that our freedoms and our generosity do more than sustain a longstandning national heritage of prosperity. They helped to create our prosperity as well. We are great, we are free and prosperous as a nation because we are generous — quick to give and quick to forgive.

It’s a good Post-election attitude to strive for as we usher in the holiday season.

—TAH