The well-known textbook publisher Pearson Education, which is British-owned, is planning a new U.S. history textbook titled “By the People” for 2019 — and here’s what’s so galling. The strikingly leftist tome goes so far as to suggest that President Donald Trump and his supporters are racist, and that they long for a bygone America in which those in power are almost exclusively white.

“Trump’s supporters saw the vote [in 2016] as a victory for the people who, like themselves, had been forgotten in a fast-changing America — a mostly older, often rural or suburban, and overwhelmingly white group,” the textbook reads, as reported by The American Mirror and other outlets. “[Hillary] Clinton’s supporters feared that the election had been determined by people who were afraid of a rapidly developing ethnic diversity of the country, discomfort with their candidate’s gender and nostalgia for an earlier time in the nation’s history.”

Oh, wait — it gets better. The president may also be unstable, according to the textbook — which will be read and studied by potentially tens of thousands of high school students across the country.

“They [the Clinton supporters] also worried about the mental instability of the president-elect and the anger that he and his supporters brought to the nation,” the textbook says.

It’s intended to be used in advanced placement classes in grades nine through 12 and supposedly went through “rigorous peer review.” It’s not yet been distributed to students.

“This is just outrageous,” one Massachusetts mom, who currently has a senior in high school, said to LifeZette. “This is why our campuses are going crazy. Kids are being taught — no, indoctrinated — to despise and distrust conservatives.”

The textbook also refers to the president as racist, and asserts that most who felt unheard by their leaders prior to the 2016 election were poor and working class, reports OneNewsNow.com.

“He was strongly anti-free trade as [Bernie] Sanders was and — like Sanders among the Democrats — Trump tapped into the sense of alienation and ‘being left behind’ that many voters — most of all white poor and working-class voters — felt,” according to the textbook’s author, James W. Fraser, in the book. “Most thought that Trump was too extreme a candidate to win the nomination, but his extremism, his anti-Establishment rhetoric and, some said, his not-very-hidden racism connected with a significant number of primary voters — more voters than any other single Republican candidate.”

Alex Clark, co-host of “The Joe and Alex Show” on WNOW in Indianapolis, Indiana, said in a tweet that the book was the latest example of “an effort going on in public school[s] to indoctrinate kids with an anti-conservative agenda.”

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The textbook feebly tempers its liberal rhetoric with well-known phrases.

“Note the book qualifies the opinions with ‘some said’ — a common tactic to insert one’s own opinion,” The Mirror wrote on Sunday. “There is no contrary opinion offered.”

Readers will be hard-pressed to overlook the obvious bias in the textbook.

“Whatever people’s opinions, on Jan. 20, 2017, Donald J. Trump was inaugurated as the 45th president of the United States,” the book states, according to The Mirror. “The inner circle of his advisers seemed to represent a mix of some deeply ideological conservatives, traditional politicians and his family. His cabinet nominees were mostly highly successful business leaders who had made their fortunes and were now joining the team of another unusually successful businessman. They were largely white males — more so than any presidential cabinet since Ronald Reagan.”

Incredibly, the text also claims that white Christians had been uncomfortable about having a black president when Barack Obama was in the White House.

“Those who had long thought of the nation as a white and Christian country sometimes found it difficult to adjust,” the Pearson book opines.

Related: How Parents Can Combat Liberal Bias in Schools

“This at once denigrates Christians and impugns their integrity and intelligence,” noted the Massachusetts mom.

The book also gives a biased version of the Michael Brown shooting in Ferguson, Missouri, in 2014, calling the law enforcement officers who were on the scene an “occupying army.”

Parents, take note about these aggressive moves by educators.

“If we don’t stand up now for our principles — especially in our schools — then we will get what we deserve,” said the Massachusetts mom.

Deirdre Reilly is a senior editor for LifeZette.