Most people are historically illiterate because we live in a world where people live in echo chambers that are distinguished by which feed they get their information from.

People in an echo chamber only get their information fed to them from a feed source, they refuse to look elsewhere for their information, and refuse to question the information being given to them, when they go outside, they selective tune out anything that conflicts with their feed source induced worldview, and instead put their focus on whatever conforms to their biases.

To control the minds of the masses their feeds don't tell them about anything except what they know will shift their minds in the direction of the narrative they'd prefer to indoctrinate them with.

for example to make people hate white people, they only inform them about bad things that were done when they were done by white people, and even then, the information about those events are selectively presented to make whites look as bad as possible, while excluding anything which makes nonwhite individuals look bad, such as ignoring black slave owners in America in order to make it seem like only white Americans owned slaves.

It's important to know that the above narrative used in the example is the one endorsed by the American government, and the government uses the education system as a feed source in order to socially engineer the opinions and beliefs of their people.

Nice straw man, pretty much nobody ever said only white people did any wrong in history