Answer: The correct answer is : The Declaration of Independence and the
United States Constitution
Explanation: Philadelphia was an important city and during the American Revolution the first and second continental congress was held there, after which it was chosen as capital of the United States but temporarily. It soon became one of the first industrial centers in the country. After the Civil War Philadelphia was run by corrupt politicians and branded as a corrupt city, from that moment on, Philadelphia supported the Democratic Party.
The best source out of these options would be : a biography of a chicago family displaced in a fire, because this family wrote the biography and they are the witness and first person in the story.
