The Black-Washing of American History

BLUF - The Liberal Elite, who hate this country and the principals it is built on, are erasing the true history of world-wide slavery.
Slavery was bad, and our founding fathers could not eliminate the scourge of slavery at the birth of our nation - the made a conscious decision to get a new nation, conceived in INDIVIDUAL Liberty, started first then come back to fix that problem. New slaves were outlawed long before the civil war and the column you should read shows the black-washing of our history. Some snippets:
Slavery has existed since time immemorial on every continent except Antarctica, as Thomas Sowell wrote years ago.
Sub-Saharan Africa had a slave economy long before Europeans came along. But there were two external African slave trade of the early modern era had two basic components: Eastern and Western. . . . Numbers are hard to come by–weirdly, the Arab slave trade hasn’t been as widely studied as the Western trade–but this source estimates that 17 million East Africans were sold into slavery in Islamic countries.
There were less than 500,000 black African slaves in the colonies and later the USA after independence. Slavery wasn't invented here and was already waning at our independence.
And OBTW, black African slave traders sold the slaves to European merchants who brought them to the western hemisphere.
Of . . . {{the 11 million black African slaves sent to the western hemisphere }} . . , only 388,747 arrived in mainland North America, what became the United States–3.6% of the total in the trans-Atlantic trade, and well under 2% of the total slaves exported from Africa.
But only we get called out for allowing slavery. There is nothing heard about Islamic slave trade, which continues to this day. It is not mentionable to call out the flaws in Islamic countries.
But virtually no one seriously opposed slavery in principle . . . . until the late 18th and early 19th centuries, when Christians in England and America, with a powerful assist from Jews, argued for the first time that slavery was wrong per se.
This is the inherent goodness of the Judeo-Christian morality versus the Islamic morality. Buy we can't point this out for fear of getting FaceBook banned. (For telling the truth.) As a final note that is never to be spoken:
Here in the U.S., the Republican Party was founded principally to combat slavery, which the Democratic Party fought bitterly to preserve. By such lies do leftists seek to undermine our country. We shouldn’t let them get away with it. When it comes to slavery, America, along with Great Britain, is on the side of the angels.
This is manifested by the fact that most Africans have come to the U.S. not as slaves, but rather voluntarily as immigrants, seeking freedom and a more prosperous life.
BLATE - The last quoted paragraph is the BOTTOM LINE.  We need to teach our children the real history of world slavery and how the USA really fits into the picture and STOP the perverion of history by the Liberal Elite.
The link to the column is:
https://www.powerlineblog.com/archives/2019/11/slavery-we-were-a-footnote.php
As usual, temperate comments are welcome.