Why was urbanization a major problem

You will write a 1-2 page paper (size 12 Times New Roman font, double spaced, black ink) on the following question:
Why was urbanization a major problem? Show three reasons why cities became a problem in the 1800s. Also, explain how they solved these problems. Show three ways that the cities were improved over the century.
Please use the textbook and the video i am going to upload as your sources. The textbook is: A History of World Societies: Volume 2: Since 1450: Eleventh Edition by McKay, Hill, Buckler, Ebrey, Beck, Croswton, and Wiesner-Hanks (Boston, MA: Bedford/St. Martin's Press, 2017). Please make sure you have the page numbers in the citations. For the slides, please include the title of each slide in the citation.