Why were tenement apartments crowded?

Answer 1

One reason they were crowded is that many people had to share space with other families.

Answer 2

Tenements were usally 6 story apartment buildings. They would spilt up the aparts into small rooms and cramp 12 people in a room the size of a halfbathroom. More than 15 familys would use the same bathroom too. Conditions were very bad and disease spread very fast in these conditions.

Answer 3

Yes, these are small and crowded.