Columbia subject headings:
Great Britain--Politics and government.
Great Britain--Race relations.
Slave trade--Great Britain--History.
Slave trade--United States--History.
Slavery--Great Britain--History.
Slavery--United States--History.
United States--Politics and government.
United States--Race relations.
Harvard subject headings:
Great Britain--Politics and government.
Great Britain--Race relations.
Slave trade--Great Britain--History
Slave trade--United States--History
Slavery--Great Britain--History.
Slavery--United States--History
United States--Politics and government.
United States--Race relations
Princeton subject headings:
Great Britain--Politics and government.
Great Britain--Race relations.
Slave trade--Great Britain--History.
Slave trade--United States--History.
Slavery--Great Britain--History.
Slavery--United States--History.
United States--Politics and government.
United States--Race relations.