You're not American and lack common knowledge, yet somehow you feel comfortable making a blanket statement that most African-Americans don't know at least a little about their history, even anecdotally? This is not an /r/AskHistorians question, it's an /r/LogicalFallacyCourt question.

Not discouraging discussion here (although moderator warning: no personal anecdotes or conjecture in this sub, please!), but this question may be better suited to /r/AskSocialScience: possibly there have been studies