One needn't “incorporate” it at all, because back history in the United States IS American history. From Crispus Attucks, to Frederick Douglas, to George Washington Carver, to Henry Flipper, to Booker T. Washington, to MLK and all the way to Obama, good or bad, it's All American.
Unfortunately, that is not how it is taught in schools. If that were the case, there would be no need for Black History Month.