Well that is fascination information
D. Introduce the bull again later I hope this helps!
Answer:
Overcrowding
<span>Sewage systems
Tenement houses</span>
Explanation:
Since many people crammed into small areas in order to be close to the factories in which they worked you had overcrowding and tenement houses. Also in the early stages they tend to have problems with sewage systems which caused a lot of sickness and bad smelling streets.
Cause they were in japan and it was during war time
