Why did muckraking journalist Jacob Riis use flash photography?

Jacob Riis used flash Photography to expose the harsh realities of life in New York City's tenements during the late 19th century. The innovative technology allowed him to capture stark images in poorly lit, overcrowded living conditions, providing a powerful visual representation of poverty and social injustice. His photographs complemented his written work, helping to raise public awareness and galvanize support for social reforms. By using flash photography, Riis effectively illustrated the urgent need for change in urban living conditions.