The first time “free white person” was used as a restriction for citizenship in the US.
Source: A Century of Lawmaking for a New Nation: U.S. Congressional Documents and Debates, 1774 – 1875
Statutes at Large, 1st Congress, 2nd Session
Page 103 of 755
http://rs6.loc.gov/cgi-bin/ampage?collId=llsl&fileName=001/llsl001.db&recNum=226