“When a midnight inspection in Mulberry Street unearths a hu…

“When a midnight inspection in Mulberry Street unearths a hundred and fifty ‘lodgers’ sleeping on filthy floors in two buildings… In a room not thirteen feet either way, slept twelve men and women, two or three in bunk, the rest on the floor; a single room, but five families split it up into as many separate households… The atmosphere was simply stifling… the water does not rise in summer to the second story, and the stench from the sewers and the households is something terrible.”  – Jacob Riis How the Other Half Lives  The above quotation is most likely talking about which urban problem?