Columbia subject headings:
Slave trade--United States.
Harvard subject headings:
Antislavery movements--United States--History.
Slave trade--United States--History
Slavery--Law and legislation--United States--History
Slavery--United States--History
Princeton subject headings:
Antislavery movements--United States--History.
Slave trade--United States--History.
Slavery--Law and legislation--United States--History.
Slavery--United States--History.