Answer:
<em><u>The answer is</u></em>: <u>Immigrants, diseases and abuse.</u>
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Explanation:
<u>How the Other Half Lives</u> was a pioneering photojournalism work by Jacob Riis, which documents the miserable living conditions in the slums of New York City in the 1880s, <u>stimulated the first major New York legislation to curb the bad housing conditions</u>.
Jacob Riis documented the slums of New York, what he considered the world of the "<u>other half</u>," full of immigrants, diseases and abuse.
<em><u>The answer is</u></em>: <u>Immigrants, diseases and abuse.</u>