As a result of the Industrial Revolution. A many workers were forced to live in slum conditions.
B overseas migration increased.
C workers salaries doubled.
D working conditions improved​

A.many workers were forced to live in slum conditions.

Explanation: While technology improved, many other things did not, cities grew rapidly and became severely over populated, leaving many with unfair wages, awful working conditions, and living in the slums.  

according to worldatlas.com, the u.s. has an 86% literacy rate.

barrio is a spanish word meaning neighborhood. in spain, several latin american countries and the philippines, the term is also used officially to denote a division of a municipality while a ghetto is a part of a city in which members of a minority group live, typically as a result of social, legal, or economic pressure. the term may have originally been used in venice to describe the part of the city to which jews were restricted and segregated.