Federalist No. 42 http://econfaculty.gmu.edu/wew/quotes/slavery.html
1780s, Federalist Papers (1787–1788)
“The United States, having been the first to abolish within the extent of their authority the transportation of the natives of Africa into slavery, by prohibiting the introduction of slaves and by punishing their citizens participating in the traffic, can not but be gratified at the progress made by concurrent efforts of other nations toward a general suppression of so great an evil.”
They must feel at the same time the greater solicitude to give the fullest efficacy to their own regulations. With that view, the interposition of Congress appears to be required by the violations and evasions which it is suggested are chargeable on unworthy citizens who mingle in the slave trade under foreign flags and with foreign ports, and by collusive importations of slaves into the United States through adjoining ports and territories. I present the subject to Congress with a full assurance of their disposition to apply all the remedy which can be afforded by an amendment of the law. The regulations which were intended to guard against abuses of a kindred character in the trade between the several States ought also to be rendered more effectual for their humane object.
James Madison's Eighth State of the Union Address (3 December 1816)
1810s
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James Madison 145
4th president of the United States (1809 to 1817) 1751–1836Related quotes
1870s, Second State of the Union Address (1870)
1800s, Second Presidential Administration (1805-1809)
Context: I congratulate you, fellow citizens, on the approach of the period at which you may interpose your authority constitutionally to withdraw the citizens of the United States from all further participation in those violations of human rights which have been so long continued on the un-offending inhabitants of Africa, and which the morality, the reputation, and the best of our country have long been eager to proscribe. Although no law you may pass can take prohibitory effect until the first day of the year 1808, yet the intervening period is not too long to prevent by timely notice expeditions which can not be completed before that day.
Thomas Jefferson's Sixth State of the Union Address (2 December 1806)
1850s, The House Divided speech (1858)
2000s, The Logic of the Colorblind Constitution (2004)
Proposed amendment https://books.google.com/books?id=pmZEAQAAIAAJ&pg=PA24&dq=%22james+madison%22+%22property+in+man%22&hl=en&sa=X&ved=0ahUKEwiwiczw5s_LAhVMOT4KHaM8CdMQ6AEINDAA#v=onepage&q=%22james%20madison%22%20%22property%20in%20man%22&f=false (8 April 1864)
Source: Writings, Politics of Guilt and Pity (1978), pp. 3-4
Source: god is Not Great: How Religion Poisons Everything
1850s, The Present Aspect of the Slavery Question (1859)
We stick to the policy of our fathers.
1860s, Speech at Hartford (1860)