"In 1869 there were 14,872 tenements in New York, with a population of 468,492 persons. In 1879 the number of the tenements was estimated at 21,000, and their tenants had passed the half-million mark. At the end of the year 1888, when a regular census was made for the first time since 1869, the showing was: 32,390 tenements, with a population of 1,093,701 souls. Today we have 37,316 tenements, including 2,630 rear houses, and their population is over 1,250,000 . . . This drift of the population to the great cities has to be taken into account as a steady factor. It will probably increase rather than decrease for many years to come. At the beginning of the century the percentage of our population that lived in cities was one in twenty-five. In 1880 it was one in four and one-half, and in 1890 the census will in all probability show it to be one in four..."

-Jacob Riis, How the Other Half Lives, 1890, Chapter 24

What urban problem is the author discussing? Describe the problem the author is discussing using two examples from the document to support the answer. Be sure to use evidence from the documents to support your answer and explain how the evidence supports your answer.