A general note about history.
What is considered history or what is given priority as historically significant is not static, nor is it universal.
When a national or region selects possible curriclum, it is shaping a collective national identity, a shared inclusive narrative.
If a curriculum focuses on white people, who for centuries had the privilage of writing history, particularly in the US, then this can help maintain and reinforce and a national narrative that excludes Black people.
There are other examples, for instance the Irish. There are two reasons that differentiates the Irish american narrative from the African american narrative. Firstly the Irish did not have their personal or cultural identities, stripped when being bought over to the US as slaves. And shared skin culture allows for easier assimilation into the established cultural narrative.
Due to the circumstances in which many Black Americans where bought to the U.S., as a race has had it's contributions vastly underepresented.
And whilst I realsise that the topic was relating to "A history month in the U.S." similar projects happen elsewhere, for example in the U.K.
This change in emphasis and perspective on educating and understanding 'history', is in fact about shifting the national identity to make it more inclusive, fairer and equal.
And history is always political, whether it is selected by teachers or politicians. If a teacher is given free licence to choose a curriculum, his or her choice will be as much shaped by his or her politics as any government.