And the only reason Black History Month exists is because black contributions to American History were overlooked in regular history. American History was and is still seen as White History by many people.
There are two states which have an outsized influence on our textbooks -
California and Texas.
If you are a liberal, Texas is the more problematic of the two given how politicized the process of writing textbooks already is. And as long as it remains a conservative Republican state, we should expect this state of affairs to continue for at least another decade. I hope Texas Democrats pay close attention (if they aren't already) to who is elected to the Texas State Board of Education, for they decide what should be taught to future generations.