Answer:
The working poor.
Explanation:
The Gilded Age was a period between the Civil War and the turn of the 20th century. There was a rapid development of America during this period and large growth of industry and technology.
With the growth of the industries the majority of the population started to work in factories since most of the factories were located in the major cities, the group that was the main residents of the inner city during this period were the working poor who lived and worked in poor conditions.
