At the turn of the 18th Century, immigrants piled into stuffed and cramped building's called tenements all around crowded cities.
Due to cities being packed with Tenements house's that hold an average of 2 to 3 family's, the apartment's were filthy and so were the familys due to the overcrowding of people and the build up of trash.
The Tenements and side walks were made of wood, meaning the whole city could catch on fire leaving tenement residence homeless and the city destroyed.
Fire Fighters and City engineers helped with the fires, and the city engineers had developed indoor plumbing.
The fire's were controlled due to the fire fighters and that prevented the whole city from burning down.
Garbage lining the streets were fixed with the innovation of indoor plumbing, although some tenements did not have indoor plumbing it helped prevent the build up of trash. If we did not have Fire fighters and indoor plumbing, cities would still burn and town's will be filthy.