I want to know the answer to the following question:
Which part in particular became urbanised in the 20th century?
All the background I'm provided with is that "The borders around the Manchester area were particularly complicated, with narrow protrusions of the administrative county between the county boroughs – Lees urban district formed a detached part of the administrative county, between Oldham county borough and the West Riding of Yorkshire.". Is that enough to answer the question?
Answer: no