Which area on the map has the greatest urban population at the start of the twentieth century

The northeastern portion of the east coast, region D, had the largest urban population by the start of the Twentieth Century. The area's industrialization and increased immigration from Europe helped to make this possible. CIties such as New York, Boston, and Philadelphia were some of the major urban areas here.

a

explanation:

small european communities with shared traditions consolidated into large new states (apex)