Where was much of Montreal's industry during the late 19th and early-to-mid 20th century?
The Sud-Ouest borough was home to much of the city's industry during the late 19th and early-to-mid 20th century. 
{"article_title": "Montreal", "article_file": "data/set3/a7", "difficulty_questioner": "hard", "diffculty_answerer": "easy", "quality": true}