A more unified african american culture began to emerge in the early decades of the nineteenth century because?

I'm afraid you are not likely to get an accurate answer to this question as it is not complete. This is a multiple choice question, and in order to answer it we would need to see the 3 or 4 alternative answers that probably go with it. If you would like to try again and send the alternative answers this time, someone should be able to help  you.