It's not a bad assumption to make. My history-major dad who learned Russian for the US military isn't entirely familiar with even the events in Ukraine of 2013-2022. It's pretty much guaranteed your average American doesn't know near enough to have any context for the narrative history Putin is trying to explain.
Honestly the US is likely the most historically illiterate country in the world. On sites like this, you'll run into a lot of Americans that know at least some history, but that's not the average normie American. Numerous studies have been done and have found that the vast majority of Americans can't even pass history tests that are required for US citizenship, so your average goat fucker with less than 30 minutes of studying has more knowledge of US history than your average native born mutt.
https://nypost.com/2019/02/15/americans-dont-know-much-about-nations-history-survey/
This doesn't even touch on the number of mutts that have North Korean brainwashing levels of junk historical education.
If you talk to a mutt that was in school before about 1980, the US is this country that never did anything wrong, won every single war it ever fought, was the only nation to ever exist with any kind of basic human rights and all previous societies took men's virgin wives on their wedding nights because their deflowering was a noble privilege. The US also won its independence from the evil British who are now somehow second greatest allies with zero help from France which was always a nation of surrender monkeys. Rome and ancient Greece may or may not have even existed, but if they did they would have loved the US system unanimously, and people like Aristotle and Plato were great proponents of democracy. The Crusades didn't exist and Christianity wasn't invented prior to the early 1600s. Spain also = Mexico and Spanish people wear sombreros and eat tacos.
Talk to mutts that went to school past 1980 and everything was invented by a black guy, a gay, or a woman, and there are no examples of any members of one of those groups having done anything wrong whatsoever. The US is this evil empire except for these brief periods in history where it was using weapons of mass destruction against civilian populations and then it was a great liberator. US independence was won by some black guy. All white people have slaver ancestors even if they hail from generations of gallic dirt farmers that didn't arrive in the US before the 1900s. Roving bands of white people killed millions of black people in the 1950s and everyone just beat the shit out of their wives. Romans weren't white and they loved homosexuality and endlessly had buttsex at every public event. They were only white when they engaged in slavery and all their slaves weren't white. Ancient Greece was a land of infinite buttsex and pedophilia and that was a good thing. People like Alexander the great, despite being a horrible person that killed off the great brown people empire of ancient Persia in a horrible act of (sometimes) white supremacy was also a brave homosexual despite marrying and having children with Roxana who was certainly a strong woman, who'd eventually have a black descendant named Cleopatra that did absolutely nothing wrong and was a great queen. The Crusades were fought against black Muslims in order to exterminate all homosexual Muslims that only wanted peace and had never taken any land by force. Constantinople was freed by brave local Islamic freedom fighters that pushed out that evil Byzantine empire that had taken that had freed the oppressed population of NOT GREEKs there.
All of the above may sound like a schizo rant and it pretty much is, but this is legit the kind of shit mutts are taught in the US school system.