Western civilization has been history's best refuge in the past. Certainly, there have been attempts to rewrite the past, but there have been enough serious people, who respected the truth, so that reality was always at hand.
Not so much today. As usual, the politically correct crowd are the culprits. They have this insane need to judge the past by today's standards. Not just today's standards, but today's politically correct standards.
Slavery was wrong. Our new nation recognized this early on and banned the importation of slaves in the early eighteen hundreds, shortly after the Constitution was ratified. We still had slavery, however, until Lincoln's Emancipation Proclamation. Slavery was institutionalized and it took some time and a bloody war to end it.
That is history. We can't go back and change it. No one in America today owns slaves. No one in America today lives as a slave. (Yes, I am aware that there are some criminal activities that belie my statement.) But there is slavery rampant in the world today. Politicians, the press, even the UN all seem to turn a blind eye toward that reality.
The PC group seem to be more interested in pulling down statues, burning historical flags, and renaming various edifices to bury the past that they despise.
In olden days it was considered the right and proper thing to do for western civilization to expand and colonize. It was thought that they were bringing civilization and religion to heathen lands.
Terrible things were done by any standards. Civilization was far less civilized in those days. That is history. Learn it and learn by it. Understanding it is not accepting it. There is enough in today's world that needs correction without trying to alter an unalterable past.