<span>Conditions in a tenement neighborhood are very unsanitary and dirty. They meet the lowest level of requirements for people to live in. They are for people who have nowhere else to go because they can not afford to. People live very close together in very small living quarters.</span>
Overcrowding was most directly contributed to the spread of disease in city tenements in the early 1900.
Back then , the city was shocked by smallpox epidemic. Since smallpox is easily transmitted by contact, overcrowded areas are the perfect breeding spot for smallpox ( they still has not developed small pox vaccine back then)
"In order to shake a hypothesis, it is sometimes not necessary to do anything more than push it as far as it will go."
