Question: Until which year did this territory created by Northwest Ordinance legally exist?
Sentence (from "Northwest Territory"): The post-American Revolutionary War Territory Northwest of the River Ohio, more commonly known as the Northwest Territory encompassing most of the pre-war territory of the Ohio Country, parts of Illinois Country, and parts of old French Canada below the Great Lakes was an organized incorporated territory of the United States spanning most or large parts of six eventual U.S. States.
Relevant evidence: No