In what city and state do the first chapters of Fever 1793 take place?

The first
two chapters take place in downtown Philadelphia, Pennsylvania, in the early days of the new
United States.

Anderson locates us quickly in this setting as Mattie informs
us:

My favorite place was the waterfront. I squinted
eastward. The rooftop of the State House, where the Congress met, was visible, but the August
haze and dust from the street made it impossible to see farther than that. On a clear day, I
could see the masts of the ships tied up at the wharves on the Delaware River.

The locale moves from Mattie's home (where she wakes up in the
morning) to the coffeehouse her father opened before he died, which is still run by Mattie's
mother and grandfather.

Philadelphia was a major city theneven more so than
it is todayand Anderson captures some of its energy from the start of the story, mentioning, for
instance, technological innovations such as the "remarkable" air balloon that Mattie
describes as like a "yellow silk bubble" that now resides in the courtyard of the
nearby Walnut Street prison. However, there are also locations that indicate that this is still
an eighteenth-century town: such as the blacksmith'd forge, which Mattie is none too fond
of.