African american female characters who often appear as background scenery in television shows serve to perpetuate

cultural imperialism

Explanation:

According to my research on different cultural terminology, I can say that based on the information provided within the question this situation is done to perpetuate cultural imperialism. This term is basically defined as the creation and maintenance of unequal economic roles between civilizations, favoring a more powerful groups over the less fortunate. Which is why minorities are placed in the background in certain television series trying to demonstrate this.

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the density would be a smaller number.