Read the information below:

In 1840, the population of Chicago was only 4,470. By 1900, the city's population was 1,698,575.

Which factor contributed most to the population change?
African Americans escaping poverty and discrimination in the South The expansion of Chicago's boundaries into surrounding counties Chicago's location as a railroad hub between the East and the West Chicago's improvements in sanitation and health care

Question

Read the information below:

In 1840, the population of Chicago was only 4,470. By 1900, the city's population was 1,698,575.

Which factor contributed most to the population change?
African Americans escaping poverty and discrimination in the South The expansion of Chicago's boundaries into surrounding counties Chicago's location as a railroad hub between the East and the West Chicago's improvements in sanitation and health care