This point rewards bringing in a genuinely new piece of historical knowledge - something not mentioned in any of the provided documents - and using it to support your argument.
"...the domestic slave trade that grew after the 1808 ban on international slave importation reshaped family life for enslaved Americans..."
This earns the point - the 1808 import ban and the domestic slave trade it triggered is a specific historical development outside the documents, and it's used to support the essay's argument about slavery's expansion.
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