I don't know why people treat history books as if they're fact.
There is no way any of us can know what actually happened. It's all hypothetical. Inaccurate information can be passed down. Biased information can be passed down.
We have advanced technology now which makes it easier for us to know things, and yet we still don't know who the Zodiac killer is or what really happened to Malaysia Airlines Flight 370, but people expect us to believe that things that happened before 1900 are accurate because they were documented that way. I mean, for all we know American slavery started because some black guy stole some white guy's horse, or that the declaration of independence was signed without pants on and they didn't want that information getting out there so they lied about it.
I'm not buying into these shenanigans that we have to open a history book to understand it.