Who was the last American divorcee to marry royalty?

Wallis Warfield Simpson had a Palm Beach connection.

Queen Elizabeth is practically giddy over Prince Harry’s engagement to Meghan Markle, who happens to be American and divorced.

The queen can blame another American divorcee, Wallis Warfield Simpson, for the fact that she’s queen at all.

If not for Wallis, Elizabeth might be spending her 90s relaxing with her corgis and her sherry and just being a sweet old lady.

Alas…along came Wallis Warfield Simpson, the scandalous shining star in one of the most infamous love stories of the 20th century.

Wallis became involved with King Edward VIII while she was still married to her second husband, Ernest Simpson.

Edward had hoped to make Wallis the queen of England — but, of course, that would not be allowed in 1936.

So, for the first time in nearly nine centuries, an English monarch abdicated the throne — and the crown went to King Edward’s brother and Elizabeth’s father, who became King George VI.

An excerpt from Edward’s radio broadcast, from Dec. 11, 1936: “I have found it impossible to carry the heavy burden of responsibility and discharge my duties as king without the help and support of the woman I love.”

Inside the Seminole Inn in Indiantown, there’s a framed newspaper clipping from the day after the speech. It’s tattered, yellowed. EDWARD RENOUNCES BRITISH THRONE, the headline says.

Why is this clipping inside the historic Seminole Inn?

Because Wallis Warfield Simpson, who became the Duchess of Windsor, was the niece of the inn’s first owner, Baltimore banker, S. Davies Warfield. He had a dream to make Indiantown a thriving hub for Florida business, transportation and development.

The Seminole Inn opened in December 1926. Hundreds of folks came to that gala event — including Wallis Warf- ield Simpson.

If not for Wallis, Elizabeth might be spending her 90s relaxing with her corgis and her sherry and just being a sweet old lady.

She acted as a social hostess for the evening, but she didn’t bus any tables.

Wallis was the star of this show in the middle of nowhere.

Later, when she and her “king” partied, they did so as the Duke and Duchess of Windsor. They often visited Palm Beach, where they were known to freeload off famous friends such as Marjorie Merriweather Post, first owner of President Donald Trump’s Mar-a-Lago.

When in Palm Beach, they did as the affluent locals do: The duke played golf, and the duchess shopped on Worth Avenue.

CONTRIBUTED Duchess and Duke of Windsor arrive in Palm Beach on one of their many visits. Even though a local headline proclaimed “Palm Beach is considered as Windsor Home” in 1937, the couple did not make their first visit until four years later.