A more unified African American culture began to emerge in the early decades of the nineteenth century because...

  

• the Gullah dialect spread to the new slave territories in the Old Southwest.
• the rapid transfer of slaves from other regions into the Lower Mississippi Valley significantly minimized cultural differences.
• blacks rejuvenated African customs as the transatlantic slave trade ceased.
• most slaves were united by their traditional religion, which persisted despite the efforts of white Christians to convert them. 

ANSWER: A more unified African American culture began to emerge in the early decades of the nineteenth century because the rapid transfer of slaves from other regions into the Lower Mississippi Valley significantly minimized cultural differences.