"Art. 6. There shall be neither slavery nor involuntary servitude in the said territory, otherwise than in the punishment of crimes whereof the party shall have been duly convicted: Provided, always, That any person escaping into the same, from whom labor or service is lawfully claimed in any one of the original States ... may be lawfully reclaimed and conveyed to the person claiming his or her labor or service as aforesaid."
The excerpt is from the Northwest Ordinance.
In what year was it passed?