In medieval towns, unhealthy living conditions led to the spread of illness. The town were very dirty places. There was no running water in homes, and people used outdoor privies or chamber pots instead of bathrooms, which they emptied into nearby streams and canals.
It’s to expensive because in the cartoon it says “Without bankrupting the government” which means it’s too expensive.
Generally speaking, while Alexander Hamilton supported merchants, Thomas Jefferson was more sympathetic toward the needs of "farmers", since Jefferson's view of the US was highly agrarian.
They were pleased because this would keep the people from moving into their land