The document provides an overview of life in the Gilded Age in the United States. Key developments included the expansion of industry and new inventions like the light bulb which allowed factories to operate longer hours. Railroads linked the nation together but were often corrupt. Large businesses consolidated into monopolies and trusts controlled by wealthy businessmen known as "robber barons". Labor unions formed to improve dangerous working conditions but faced opposition. Large numbers of immigrants arrived from southern and eastern Europe, facing challenges integrating into American society. Urbanization increased and cities struggled with problems like poor housing and sanitation.