Due to racial amalgamation, there was ambiguity in racial roles. Whites feared the extinction of their race and thus this fear dictated their subsequent actions, while Blacks enjoyed the dominance of their genes in the gene pool.

Do you have a question? I doubt any blacks living in the 18th century would say they "enjoyed the dominance of their genes" - I don't even know what that it this is trying to say. And the idea that "whites feared the extinction of their race" is an incredibly broad and erroneous generalization.

In the 19th century there was almost no real serious mixing of the races. And the blacks were dealing with other serious social issues during this time frame.

If this is a statement for anything, I see little value or truth in the statement esp with the point no one really understood genes and those issues at that time.