Answer: Because its fertile land, coffee plantations, industries and transport facilities attracted people to settle together in one place.
- Sao Paulo grew on a plateau where the climate is pleasant and the soil is fertile for coffee, which became its main crop.
- It is a meeting point of railways and roads and has a large port nearby at Santos, so trade and industry grew rapidly.
- Industries such as automobiles, machinery, textiles and food processing provided employment to lakhs of workers.
- Schools, hospitals, banks and markets developed in the same place, so houses and factories are clustered together in a nucleated pattern.