Thomas Jefferson (1743–1826) 3rd President of the United States of America
I pray you therefore to accept my thanks for the many instances you have enabled me to observe of respectable intelligence in that race of men, which cannot fail to have effect in hastening the day of their relief; [...]. <br class="br"> Letter to Henri Grégoire http://memory.loc.gov/cgi-bin/query/r?ammem/mtj:@field(DOCID+@lit(tj110052)) (25 February 1809), as quoted in The Works of Thomas Jefferson in Twelve Volumes. Federal Edition. Collected and Edited by Paul Leicester Ford. Also quoted in The Science and Politics of Racial Research by William H. Tucker (1994), p. 11 <br class="br">1800s, Second Presidential Administration (1805-1809)