Respuesta :
i'd say b cause thats when they started buildiing more buildings and houses for people
The correct answer is D) increasing migration to cities by poor families.
The Gilded Age in America saw a significant increase in migration to cities by all different types of Americans, especially poor families. This is due to the fact that new industries/factories were opening up in cities. These factories relied on a significant amount of labor in order to thrive. In this case, many poor families flocked to the city in hopes of obtaining a job where that would help improve their finanical situation.