Poulson's American Daily Advertiser (Philadelphia, March 20, 1818) "Spain Consents to Abolition of Slave Trade" -- A Treaty concluded and signed at Madrid by Sir H. Wellesley and M. Pizarro. Spaniards prohibited from going North of the line to purchase Negroes from date of last ratification. Notes dates and places of ratifications. More on penalties for trade and importation of slaves and compensation.
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