The globalist billionaire who funded the woke transformation of Thomas Jefferson’s Monticello paid for a similar overhaul of James Madison’s house — where the author of the US Constitution has been shoved into a supporting role, while slavery and racism take center stage.

No American flags fly at Montpelier, Madison’s plantation home in rural Virginia, and not a single display focuses on the life and accomplishments of America’s foremost political philosopher, who created our three-branch federal system of government, wrote the Bill of Rights and the Federalist Papers, and served two terms as president.

Instead, blindsided tourists are hammered by high-tech exhibits about Madison’s slaves and current racial conflicts, thanks to a $10 million grant from left-leaning philanthropist David M. Rubenstein.

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Visitors to Montpelier get to see just three rooms in the sprawling mansion. The estate “made Madison the philosopher, farmer, statesman, and enslaver that he was,” the guide said as The Post’s group entered the home — a line she repeated at the end of her spiel.

Outdoors and in the house’s huge basement, dozens of interactive stations seek to draw a direct line between slavery, the Constitution, and the problems of African Americans today.

“A one hour Critical Race Theory experience disguised as a tour,” groused Mike Lapolla of Tulsa, Okla., after visiting last August.

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The only in-depth material about the Constitution itself appears in a display that pushes the claim, championed by the controversial 1619 Project, that racism was the driving force behind the entire American political system.

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But the progressive programming will likely accelerate in the wake of a board battle at the Montpelier Foundation, the nonprofit that runs the estate.

In May, the National Trust for Historic Preservation, which owns the home, forced the board to accept a slate of left-wing activist members in the name of racial equity.

The new members aim to transform Montpelier into “a black history and black rights organization that could care less about James Madison and his legacy,” board member Mary Alexander, a documented descendant of Madison’s slave Paul Jennings, told the Orange County Review.

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