Final answer:
The work 'How the Other Half Lives' by Jacob Riis illuminated two major problems: deplorable living conditions in tenements and economic disparity.
Step-by-step explanation:
Living conditions in neighborhoods: The book highlights the squalid living conditions in neighborhoods like New York's Hell's Kitchen, exposing the overcrowded tenements, lack of sanitation, and poor housing conditions. He states, "The bunk beds inside of the tenement apartment being described are not very stable and the room designated as a bedroom is nothing like the concept we have as a ‘bedroom’ today. The bedroom is small, crowded, has a distinct unpleasant odor and is not very sanitary."
Economic disparity: How the Other Half Lives exposes the wide gap between the wealthy and the working poor, demonstrating the harsh realities of poverty and the exploitation of factory workers.