Final answer:
Franklin gives detail about his first day in Philadelphia to establish his background and emphasize the hard work and determination that led to his success.
Step-by-step explanation:
Franklin gives so much detail about his first day in Philadelphia because it helps to establish his background and set the stage for his journey towards success.
By describing his humble beginnings and the challenges he faced, Franklin is able to emphasize the hard work and determination that led to his achievements. The detailed account also provides insight into the historical context of Philadelphia during that time period.